diff --git a/Elwig/App.xaml b/Elwig/App.xaml
index fb1d62a..5aa2aa1 100644
--- a/Elwig/App.xaml
+++ b/Elwig/App.xaml
@@ -60,6 +60,12 @@
             </StackPanel>
         </DataTemplate>
 
+        <DataTemplate x:Key="WineAttributeTemplate">
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="{Binding Name}" MinWidth="150" Margin="0,0,10,0"/>
+            </StackPanel>
+        </DataTemplate>
+
         <ControlTemplate x:Key="WineQualityLevelTemplateSimple">
             <StackPanel Orientation="Horizontal">
                 <TextBlock Text="{Binding Name}"/>
diff --git a/Elwig/Models/WineAttr.cs b/Elwig/Models/WineAttr.cs
index dfe8bea..7074ca0 100644
--- a/Elwig/Models/WineAttr.cs
+++ b/Elwig/Models/WineAttr.cs
@@ -15,5 +15,8 @@ namespace Elwig.Models {
 
         [Column("active")]
         public bool IsActive { get; set; }
+        public override string ToString() {
+            return Name;
+        }
     }
 }
diff --git a/Elwig/Windows/AreaComAdminWindow.xaml b/Elwig/Windows/AreaComAdminWindow.xaml
index 96ec0d5..6a97464 100644
--- a/Elwig/Windows/AreaComAdminWindow.xaml
+++ b/Elwig/Windows/AreaComAdminWindow.xaml
@@ -5,7 +5,8 @@
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:Elwig.Windows"
         mc:Ignorable="d"
-        Title="Flächenbindugen - Elwig" Height="500" Width="950"
+        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
+        Title="Flächenbindugen - Elwig" Height="480" Width="745"
         Loaded="Window_Loaded">
     <Window.Resources>
         <Style TargetType="Label">
@@ -30,6 +31,13 @@
             <Setter Property="HorizontalAlignment" Value="Stretch"/>
             <Setter Property="VerticalAlignment" Value="Top"/>
         </Style>
+        <Style TargetType="xctk:CheckComboBox">
+            <Setter Property="IsEnabled" Value="False"/>
+            <Setter Property="Height" Value="25"/>
+            <Setter Property="FontSize" Value="14"/>
+            <Setter Property="HorizontalAlignment" Value="Stretch"/>
+            <Setter Property="VerticalAlignment" Value="Top"/>
+        </Style>
         <Style TargetType="Button">
             <Setter Property="FontSize" Value="14"/>
             <Setter Property="Padding" Value="9,3"/>
@@ -39,78 +47,53 @@
     <Grid>
         <Grid.RowDefinitions>
             <RowDefinition Height="19"/>
-            <RowDefinition Height="120"/>
-            <RowDefinition Height="190"/>
+            <RowDefinition Height="110"/>
+            <RowDefinition Height="175"/>
             <RowDefinition Height="1*"/>
         </Grid.RowDefinitions>
         <Grid.ColumnDefinitions>
-            <ColumnDefinition Width="620"/>
+            <ColumnDefinition Width="415"/>
             <ColumnDefinition Width="1*"/>
         </Grid.ColumnDefinitions>
 
-        <Menu Grid.ColumnSpan="3" BorderThickness="0,0,0,1" BorderBrush="LightGray" Background="White">
+        <Menu Grid.ColumnSpan="2" BorderThickness="0,0,0,1" BorderBrush="LightGray" Background="White">
             <MenuItem Header="Flächenbindugen"/>
         </Menu>
 
-        <Grid Grid.RowSpan="4" Grid.Row="1">
+        <Grid Grid.RowSpan="3" Grid.Row="1" Grid.Column="0">
             <Grid.ColumnDefinitions>
-                <ColumnDefinition Width="125"/>
-                <ColumnDefinition Width="120"/>
-                <ColumnDefinition Width="125"/>
-                <ColumnDefinition Width="125"/>
-                <ColumnDefinition Width="125"/>
+                <ColumnDefinition Width="1*"/>
+                <ColumnDefinition Width="1*"/>
+                <ColumnDefinition Width="1*"/>
             </Grid.ColumnDefinitions>
 
-            <DataGrid x:Name="ContractList" AutoGenerateColumns="False" HeadersVisibility="Column" IsReadOnly="True" GridLinesVisibility="None" SelectionMode="Single"
-                  CanUserDeleteRows="False" CanUserResizeRows="False" CanUserAddRows="False" SelectionChanged="ContractList_SelectionChanged" Grid.Column="0" Grid.Row="1"
-                  Margin="10,10,5,47" FontSize="14" Grid.ColumnSpan="2" Background="#e2e2e2">
-                <DataGrid.Columns>
-                    <DataGridTextColumn Header="VNr."  Binding="{Binding VNr}"       Width="*"/>
-                    <DataGridTextColumn Header="Von"   Binding="{Binding YearFrom}"  Width="*"/>
-                    <DataGridTextColumn Header="Bis"   Binding="{Binding YearTo}"    Width="*"/>
-                </DataGrid.Columns>
-            </DataGrid>
-
-
-            <Button x:Name="NewContractButton" Content="Neu" Click="NewContractButton_Click"
-                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,10,0,10" Width="110" Grid.Column="0"/>
-            <Button x:Name="DeleteContractButton" Content="Löschen" Click="DeleteContractButton_Click" IsEnabled="False"
-                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="5,10,0,10" Width="110" Grid.Column="1"/>
-
-            <Button x:Name="ContractSaveButton" Content="Speichern" Click="ContractSaveButton_Click" IsEnabled="False" Visibility="Hidden"
-                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,10,0,10" Width="110" Grid.Column="0"/>
-            <Button x:Name="ContractCancelButton" Content="Abbrechen" Click="ContractCancelButton_Click" IsEnabled="False" Visibility="Hidden" IsCancel="True"
-                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="5,10,0,10" Width="110" Grid.Column="1"/>
-
-
-
-            <Button x:Name="NewAreaCommitmentButton" Content="Neu" Click="NewAreaCommitmentButton_Click" IsEnabled="False"
-                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="5,10,0,10" Width="110" Grid.Column="2"/>
-            <Button x:Name="EditAreaCommitmentButton" Content="Bearbeiten" Click="EditAreaCommitmentButton_Click" IsEnabled="False"
-                    HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="-5,10,0,10" Width="110" Grid.Column="3"/>
-            <Button x:Name="DeleteAreaCommitmentButton" Content="Löschen" Click="DeleteAreaCommitmentButton_Click" IsEnabled="False"
-                    HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,10,10,10" Width="110" Grid.Column="4"/>
-
-            <Button x:Name="AreaCommitmentSaveButton" Content="Speichern" Click="AreaCommitmentSaveButton_Click" IsEnabled="False" Visibility="Hidden"
-                    HorizontalAlignment="Left" VerticalAlignment="Bottom" Margin="10,10,0,10" Width="110" Grid.Column="2"/>
-            <Button x:Name="AreaCommitmentResetButton" Content="Zurücksetzen" Click="AreaCommitmentResetButton_Click" IsEnabled="False" Visibility="Hidden"
-                    HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="-5,10,0,10" Width="110" Grid.Column="3"/>
-            <Button x:Name="AreaCommitmentCancelButton" Content="Abbrechen" Click="AreaCommitmentCancelButton_Click" IsEnabled="False" Visibility="Hidden" IsCancel="True"
-                    HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="0,10,10,10" Width="110" Grid.Column="4"/>
-
             <DataGrid x:Name="AreaCommitmentList" AutoGenerateColumns="False" HeadersVisibility="Column" IsReadOnly="True" GridLinesVisibility="None" SelectionMode="Single"
-                  CanUserDeleteRows="False" CanUserResizeRows="False" CanUserAddRows="False" SelectionChanged="AreaCommitmentList_SelectionChanged" Grid.Column="2" Grid.Row="1"
-                  Margin="5,10,10,47" FontSize="14" Grid.ColumnSpan="3" Background="#e2e2e2">
+                  CanUserDeleteRows="False" CanUserResizeRows="False" CanUserAddRows="False" SelectionChanged="AreaCommitmentList_SelectionChanged" Grid.Column="0" Grid.Row="1"
+                  Margin="5,10,5,47" FontSize="14" Grid.ColumnSpan="3" Background="#e2e2e2">
                 <DataGrid.Columns>
-                    <DataGridTextColumn Header="Katastralgemeinde"  Binding="{Binding Kg.Kg.Name}"  Width="5*"/>
+                    <DataGridTextColumn Header="FbNr"               Binding="{Binding FbNr}"        Width="2*"/>
+                    <DataGridTextColumn Header="Katastralgemeinde"  Binding="{Binding Kg.AtKg.Name}"  Width="5*"/>
                     <DataGridTextColumn Header="Ried"               Binding="{Binding Rd.Name}"     Width="4*"/>
                     <DataGridTextColumn Header="Parzelle"           Binding="{Binding GstNr}"       Width="4*"/>
                 </DataGrid.Columns>
             </DataGrid>
 
+            <Button x:Name="NewAreaCommitmentButton" Content="Neu" Click="NewAreaCommitmentButton_Click"
+                    HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="5,10,5,10" Grid.Column="0"/>
+            <Button x:Name="EditAreaCommitmentButton" Content="Bearbeiten" Click="EditAreaCommitmentButton_Click" IsEnabled="False"
+                    HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="5,10,5,10" Grid.Column="1"/>
+            <Button x:Name="DeleteAreaCommitmentButton" Content="Löschen" Click="DeleteAreaCommitmentButton_Click" IsEnabled="False"
+                    HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="5,10,5,10" Grid.Column="2"/>
+
+            <Button x:Name="AreaCommitmentSaveButton" Content="Speichern" Click="AreaCommitmentSaveButton_Click" IsEnabled="False" Visibility="Hidden"
+                    HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="5,10,5,10" Grid.Column="0"/>
+            <Button x:Name="AreaCommitmentResetButton" Content="Zurücksetzen" Click="AreaCommitmentResetButton_Click" IsEnabled="False" Visibility="Hidden"
+                    HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="5,10,5,10" Grid.Column="1"/>
+            <Button x:Name="AreaCommitmentCancelButton" Content="Abbrechen" Click="AreaCommitmentCancelButton_Click" IsEnabled="False" Visibility="Hidden" IsCancel="True"
+                    HorizontalAlignment="Stretch" VerticalAlignment="Bottom" Margin="5,10,5,10" Grid.Column="2"/>
         </Grid>
 
-        <GroupBox Header="Vertrag" Grid.Column="1" Grid.Row="1" Grid.RowSpan="1" Margin="5,5,5,5">
+        <GroupBox Header="Vertrag" Grid.Column="2" Grid.Row="1" Grid.RowSpan="1" Margin="5,5,5,5">
             <Grid>
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="60"/>
@@ -119,24 +102,24 @@
                     <ColumnDefinition Width="100"/>
                 </Grid.ColumnDefinitions>
 
-                <Label Content="VNr.:" Margin="10,10,0,0" Grid.Column="0"/>
-                <TextBox x:Name="VNrInput" Margin="0,10,0,0" Width="48" Grid.Column="1" TextAlignment="Right" HorizontalAlignment="Left"
-                         TextChanged="VNrInput_TextChanged" LostFocus="VNrInput_LostFocus"/>
-                
+                <Label Content="FbNr.:" Margin="10,10,0,0" Grid.Column="0"/>
+                <TextBox x:Name="FbNrInput" Margin="0,10,0,0" Width="48" Grid.Column="1" TextAlignment="Right" HorizontalAlignment="Left"
+                         TextChanged="FbNrInput_TextChanged" LostFocus="FbNrInput_LostFocus"/>
+
                 <Label Content="MgNr.:" Margin="10,40,0,0" Grid.Column="0"/>
                 <TextBox x:Name="MgNrInput" Margin="0,40,0,0" Width="48" Grid.Column="1" TextAlignment="Right" HorizontalAlignment="Left"/>
-                
+
                 <Label Content="Von:" Margin="10,10,0,0" Grid.Column="2"/>
                 <TextBox x:Name="YearFromInput" Margin="0,10,0,0" Width="100" Grid.Column="3" TextAlignment="Right" HorizontalAlignment="Left"
-                         TextChanged="YearFromInput_TextChanged"/>
-                
+                         TextChanged="IntegerInput_TextChanged"/>
+
                 <Label Content="Bis:" Margin="10,40,0,0" Grid.Column="2"/>
                 <TextBox x:Name="YearToInput" Margin="0,40,0,0" Width="100" Grid.Column="3" TextAlignment="Right" HorizontalAlignment="Left"
-                         TextChanged="YearToInput_TextChanged"/>
+                         TextChanged="IntegerInput_TextChanged"/>
             </Grid>
         </GroupBox>
-        
-        <GroupBox Header="Lage" Grid.Column="1" Grid.Row="2" Grid.RowSpan="1" Margin="5,5,5,5">
+
+        <GroupBox Header="Lage" Grid.Column="2" Grid.Row="2" Grid.RowSpan="1" Margin="5,5,5,5">
             <Grid>
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="80"/>
@@ -147,24 +130,24 @@
                 <ComboBox x:Name="KgInput" ItemTemplate="{StaticResource KgNrTemplate}" TextSearch.TextPath="Name"
                           Width="200" HorizontalAlignment="Left" SelectionChanged="KgInput_SelectionChanged"
                           Margin="0,10,10,0" Grid.Column="1"/>
-                
+
                 <Label Content="Ried:" Margin="10,40,0,0" Grid.Column="0"/>
                 <ComboBox x:Name="RdInput" DisplayMemberPath="Name" TextSearch.TextPath="Name"
                           Width="200" HorizontalAlignment="Left"
                           Margin="0,40,0,0" Grid.Column="1"/>
-                
+
                 <Label Content="Parzelle:" Margin="10,70,0,0" Grid.Column="0"/>
                 <TextBox x:Name="GstNrInput" Margin="0,70,0,0" Width="100" Grid.Column="1" TextAlignment="Right" HorizontalAlignment="Left"
                          TextChanged="GstNrInput_TextChanged" LostFocus="GstNrInput_LostFocus"/>
 
                 <Label Content="Fläche (m²):" Margin="10,100,0,0" Grid.Column="0"/>
                 <TextBox x:Name="AreaInput" Margin="0,100,0,0" Width="100" Grid.Column="1" TextAlignment="Right" HorizontalAlignment="Left"
-                         TextChanged="AreaInput_TextChanged"/>
+                         TextChanged="IntegerInput_TextChanged"/>
             </Grid>
 
         </GroupBox>
 
-        <GroupBox Header="Eigenschaften" Grid.Column="1" Grid.Row="3" Grid.RowSpan="1" Margin="5,5,5,5">
+        <GroupBox Header="Eigenschaften" Grid.Column="2" Grid.Row="3" Grid.RowSpan="1" Margin="5,5,5,5">
             <Grid>
                 <Grid.ColumnDefinitions>
                     <ColumnDefinition Width="80"/>
@@ -172,20 +155,18 @@
                 </Grid.ColumnDefinitions>
 
                 <Label Content="Sorte:" Margin="10,10,0,0" Grid.Column="0"/>
-                <ComboBox x:Name="SortInput" ItemTemplate="{StaticResource WineVarietyTemplate}" TextSearch.TextPath="Name"
+                <ComboBox x:Name="WineVarietyInput" ItemTemplate="{StaticResource WineVarietyTemplate}" TextSearch.TextPath="Name"
                           Width="200" HorizontalAlignment="Left"
                           Margin="0,10,10,0" Grid.Column="1"/>
 
-                <Label Content="Attribut:" Margin="10,40,0,0" Grid.Column="0"/>
-                <ComboBox x:Name="AttrInput" DisplayMemberPath="Name" TextSearch.TextPath="Name"
-                          Width="200" HorizontalAlignment="Left"
-                          Margin="0,40,10,0" Grid.Column="1"/>
+                <Label Content="Attribute:" Margin="10,40,0,0" Grid.Column="0"/>
+                <xctk:CheckComboBox x:Name="AttributesInput" Grid.Column="1" Margin="0,40,0,0" IsEnabled="False"
+                                    ItemTemplate="{StaticResource WineAttributeTemplate}" Delimiter=", " AllItemsSelectedContent="Alle"
+                                    Width="200" HorizontalAlignment="Left" ItemSelectionChanged="AttributesInput_SelectionChanged"/>
 
                 <Label Content="Bewirt. Art:" Margin="10,70,0,0" Grid.Column="0"/>
-                <ComboBox x:Name="CultInput" DisplayMemberPath="Name" TextSearch.TextPath="Name"
-                          Width="200" HorizontalAlignment="Left"
-                          Margin="0,70,10,0" Grid.Column="1"/>
-
+                <ComboBox x:Name="WineCultivationInput" DisplayMemberPath="Name" TextSearch.TextPath="Name"
+                          Width="200" HorizontalAlignment="Left" Margin="0,70,10,0" Grid.Column="1"/>
             </Grid>
         </GroupBox>
     </Grid>
diff --git a/Elwig/Windows/AreaComAdminWindow.xaml.cs b/Elwig/Windows/AreaComAdminWindow.xaml.cs
index e076374..dd9a139 100644
--- a/Elwig/Windows/AreaComAdminWindow.xaml.cs
+++ b/Elwig/Windows/AreaComAdminWindow.xaml.cs
@@ -4,8 +4,11 @@ using System.Windows;
 using System.Windows.Controls;
 using Elwig.Helpers;
 using Elwig.Models;
-using System.Threading.Tasks;
 using System;
+using System.Threading.Tasks;
+using System.Collections.Generic;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using Xceed.Wpf.Toolkit.Primitives;
 
 namespace Elwig.Windows {
     public partial class AreaComAdminWindow : AdministrationWindow {
@@ -16,34 +19,18 @@ namespace Elwig.Windows {
             Member = Context.Members.Find(mgnr) ?? throw new ArgumentException("MgNr argument has invalid value");
             Title = $"Flächenbindungen - {Member.AdministrativeName} - Elwig";
             ExemptInputs = new Control[] {
-                MgNrInput, ContractList, AreaCommitmentList, NewContractButton, DeleteContractButton,
-                ContractSaveButton, ContractCancelButton, NewAreaCommitmentButton, 
+                MgNrInput, AreaCommitmentList, NewAreaCommitmentButton, 
                 EditAreaCommitmentButton, DeleteAreaCommitmentButton, AreaCommitmentSaveButton,
                 AreaCommitmentResetButton, AreaCommitmentCancelButton
             };
             RequiredInputs = new Control[] {
-                VNrInput, YearFromInput, KgInput,
-                GstNrInput, AreaInput, SortInput, CultInput
+                FbNrInput, YearFromInput, KgInput,
+                GstNrInput, AreaInput, WineVarietyInput, WineCultivationInput
             };
         }
 
         private async void Window_Loaded(object sender, RoutedEventArgs e) {
-            await RefreshContractList();
-            KgInput.ItemsSource = Context.WbKgs.Select(k => k.AtKg).OrderBy(k => k.Name).ToList();
-            SortInput.ItemsSource = Context.WineVarieties.OrderBy(s => s.Name).ToList();
-            AttrInput.ItemsSource = Context.WineAttributes.OrderBy(a => a.Name).ToList();
-            CultInput.ItemsSource = Context.WineCultivations.OrderBy(c => c.Name).ToList();
-        }
-
-        protected override async Task RenewContext() {
-            await base.RenewContext();
-        }
-
-        private async Task RefreshContractList() {
-            /*
-            await Context.Contracts.LoadAsync();
-            await RefreshContractListQuery();
-            */
+            await RenewContext();
         }
 
         private async Task RefreshAreaCommitmentList() {
@@ -51,51 +38,19 @@ namespace Elwig.Windows {
             await RefreshAreaCommitmentListQuery();
         }
 
-        private async Task RefreshContractListQuery() {
-            /*
-            List<Contract> contracts = await Context.Contracts.Where(c => c.MgNr == member.MgNr).ToListAsync();
-
-            ContractList.ItemsSource = contracts;
-            if (contracts.Count == 1)
-                ContractList.SelectedIndex = 0;
-
-            // TODO notwendig?
-            await RefreshAreaCommitmentList();
-            RefreshInputs();
-            */
-        }
-
         private async Task RefreshAreaCommitmentListQuery() {
-            /*
-            Contract? contract = (Contract)ContractList.SelectedItem;
-            
-            if (contract == null) {
-                AreaCommitmentList.ItemsSource = null;
-                return;
-            }
+            List<AreaCom> areaComs = await Context.AreaCommitments.Where(a => a.MgNr == Member.MgNr).OrderBy(a => a.FbNr).ToListAsync();
 
-            List<AreaComParcel> parcels = (await Context.AreaCommitments.FindAsync(contract.VNr)).Parcels.ToList();
-
-            AreaCommitmentList.ItemsSource = parcels;
-            if (parcels.Count == 1)
+            Utils.RenewItemsSource(AreaCommitmentList, areaComs, i => (i as AreaCom)?.FbNr);
+            if (areaComs.Count == 1)
                 AreaCommitmentList.SelectedIndex = 0;
+
             RefreshInputs();
-            */
         }
 
         private void RefreshInputs(bool validate = false) {
-            /*
             ClearInputStates();
-            Contract? c = (Contract)ContractList.SelectedItem;
-            AreaComParcel? a = (AreaComParcel)AreaCommitmentList.SelectedItem;
-
-            if (c != null) {
-                DeleteContractButton.IsEnabled = true;
-                NewAreaCommitmentButton.IsEnabled = true;
-            } else {
-                DeleteContractButton.IsEnabled = false;
-                NewAreaCommitmentButton.IsEnabled = false;
-            }
+            AreaCom? a = (AreaCom)AreaCommitmentList.SelectedItem;
 
             if (a != null) {
                 EditAreaCommitmentButton.IsEnabled = true;
@@ -104,49 +59,64 @@ namespace Elwig.Windows {
             } else {
                 EditAreaCommitmentButton.IsEnabled = false;
                 DeleteAreaCommitmentButton.IsEnabled = false;
+                ClearOriginalValues();
                 ClearInputs();
+                AttributesInput.UnSelectAll();
                 MgNrInput.Text = "";
             }
             if (!validate) ClearInputStates();
             GC.Collect();
-            */
         }
 
-        /*
-        private void FillInputs(AreaComParcel a) {
+        private void FillInputs(AreaCom a) {
             ClearOriginalValues();
 
-            VNrInput.Text = a.VNr.ToString();
-            MgNrInput.Text = a.AreaCom.Contract.MgNr.ToString();
-            YearFromInput.Text = a.AreaCom.Contract.YearFrom.ToString();
-            YearToInput.Text = a.AreaCom.Contract.YearTo.ToString();
+            FbNrInput.Text = a.FbNr.ToString();
+            MgNrInput.Text = a.MgNr.ToString();
+            YearFromInput.Text = a.YearFrom.ToString();
+            YearToInput.Text = a.YearTo.ToString();
 
-            KgInput.SelectedItem = a.Kg.Kg;
+            KgInput.SelectedItem = a.Kg.AtKg;
             RdInput.SelectedItem = a.Rd;
             GstNrInput.Text = a.GstNr;
             AreaInput.Text = a.Area.ToString();
 
-            SortInput.SelectedItem = a.AreaCom.WineVar;
-            // FIXME
-            //AttrInput.SelectedItem = a.WineAttr;
-            CultInput.SelectedItem = a.AreaCom.WineCult;
+            WineVarietyInput.SelectedItem = a.WineVar;
+
+            AttributesInput.UnSelectAll();
+            foreach (var attr in a.Attributes) {
+                AttributesInput.SelectedItems.Add(attr);
+            }
+
+            WineCultivationInput.SelectedItem = a.WineCult;
 
             FillOriginalValues();
         }
-        */
+
+        private async void InitInputs() {
+            FbNrInput.Text = (await Context.NextFbNr()).ToString();
+            MgNrInput.Text = Member.MgNr.ToString();
+            FillOriginalValues();
+            ValidateRequiredInputs();
+        }
+
+        protected override async Task RenewContext() {
+            await base.RenewContext();
+            Utils.RenewItemsSource(KgInput, await Context.WbKgs.Select(k => k.AtKg).OrderBy(k => k.Name).ToListAsync(), i => (i as AT_Kg)?.KgNr);
+            Utils.RenewItemsSource(WineVarietyInput, await Context.WineVarieties.OrderBy(v => v.Name).ToListAsync(), i => (i as WineVar)?.SortId);
+            Utils.RenewItemsSource(AttributesInput, await Context.WineAttributes.OrderBy(a => a.Name).ToListAsync(), i => (i as WineAttr)?.AttrId);
+            Utils.RenewItemsSource(WineCultivationInput, await Context.WineCultivations.OrderBy(c => c.Name).ToListAsync(), i => (i as WineCult)?.CultId);
+            await RefreshAreaCommitmentList();
+        }
 
         private void NewAreaCommitmentButton_Click(object sender, RoutedEventArgs evt) {
             IsCreating = true;
             AreaCommitmentList.IsEnabled = false;
             AreaCommitmentList.SelectedItem = null;
-            ContractList.IsEnabled = false;
             HideAreaCommitmentNewEditDeleteButtons();
             ShowAreaCommitmentSaveResetCancelButtons();
-            DisableContractNewDeleteButtons();
             UnlockInputs();
-            VNrInput.IsReadOnly = true;
-            YearFromInput.IsReadOnly = true;
-            YearToInput.IsReadOnly = true;
+            AttributesInput.IsEnabled = true;
             InitInputs();
         }
 
@@ -156,111 +126,73 @@ namespace Elwig.Windows {
 
             IsEditing = true;
             AreaCommitmentList.IsEnabled = false;
-            ContractList.IsEnabled = false;
 
             HideAreaCommitmentNewEditDeleteButtons();
             ShowAreaCommitmentSaveResetCancelButtons();
-            DisableContractNewDeleteButtons();
             UnlockInputs();
+            AttributesInput.IsEnabled = true;
         }
 
         private async void DeleteAreaCommitmentButton_Click(object sender, RoutedEventArgs evt) {
-            /*
-            AreaComParcel a = (AreaComParcel)AreaCommitmentList.SelectedItem;
+            AreaCom a = (AreaCom)AreaCommitmentList.SelectedItem;
             if (a == null) return;
 
             var r = MessageBox.Show(
-                $"Soll die Parzelle {a.GstNr} ({a.Area} m²) wirklich unwiderruflich gelöscht werden?",
+                $"Soll die Flächenbindung {a.GstNr} ({a.Area} m²) wirklich unwiderruflich gelöscht werden?",
                 "Parzelle löschen", MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
             if (r == MessageBoxResult.Yes) {
                 Context.Remove(a);
                 Context.SaveChanges();
                 await RefreshAreaCommitmentList();
             }
-            */
         }
 
-        private void NewContractButton_Click(object sender, RoutedEventArgs evt) {
-            IsCreating = true;
-            ContractList.IsEnabled = false;
-            ContractList.SelectedItem = null;
-            AreaCommitmentList.IsEnabled = false;
-            AreaCommitmentList.SelectedItem = null;
-            HideContractNewDeleteButtons();
-            ShowContractSaveCancelButtons();
-            DisableAreaCommitmentNewEditDeleteButtons();
-            UnlockInputs();
-            InitInputs();
-        }
-
-        private async void DeleteContractButton_Click(object sender, RoutedEventArgs evt) {
-            /*
-            Contract c = (Contract)ContractList.SelectedItem;
-            if (c == null) return;
-
-            var r = MessageBox.Show(
-                $"Soll der Vertrag {c.VNr} und alle enthaltenen Parzellen wirklich unwiderruflich gelöscht werden?",
-                "Vertrag löschen", MessageBoxButton.YesNo, MessageBoxImage.Warning, MessageBoxResult.No);
-            if (r == MessageBoxResult.Yes) {
-                Context.Remove(c);
-                Context.SaveChanges();
-                await RefreshContractList();
-            }
-            */
-        }
-
-        /*
-        private async Task<Contract> UpdateContract(Contract c) {
-            int newVNr = int.Parse(VNrInput.Text);
-            c.MgNr = int.Parse(MgNrInput.Text);
-            c.YearFrom = int.Parse(YearFromInput.Text);
-            c.YearTo = (YearToInput.Text == "") ? null : int.Parse(YearToInput.Text);
-
-            EntityEntry<Contract>? tr = null;
-            try {
-                if (IsEditing) {
-                    tr = Context.Update(c);
-                } else if (IsCreating) {
-                    c.VNr = newVNr;
-                    tr = (await Context.AddAsync(c));
-                }
-                await Context.SaveChangesAsync();
-
-                if (newVNr != c.VNr) {
-                    await Context.Database.ExecuteSqlAsync($"UPDATE contract SET vnr = {newVNr} WHERE mgnr = {c.VNr}");
-                    await Context.Contracts.LoadAsync();
-                    c = await Context.Contracts.FindAsync(newVNr);
-                }
-            } catch (Exception exc) {
-                if (tr != null) await tr.ReloadAsync();
-                var str = "Der Eintrag konnte nicht in der Datenbank aktualisiert werden!\n\n" + exc.Message;
-                if (exc.InnerException != null) str += "\n\n" + exc.InnerException.Message;
-                MessageBox.Show(str, "Vertrag aktualisieren", MessageBoxButton.OK, MessageBoxImage.Error);
-            }
-
-            return c;
-        }
-
-        private async Task<AreaComParcel> UpdateaAreaComParcel(AreaComParcel a) {
-            a.VNr = int.Parse(VNrInput.Text);
+        private async Task<AreaCom> UpdateAreaCom(AreaCom a) {
+            int newFbNr = int.Parse(FbNrInput.Text);
+            a.MgNr = int.Parse(MgNrInput.Text);
+            a.YearFrom = int.Parse(YearFromInput.Text);
+            a.YearTo = (YearToInput.Text == "") ? null : int.Parse(YearToInput.Text);
             a.KgNr = ((AT_Kg)KgInput.SelectedItem).KgNr;
-            a.RdNr = ((WbRd)RdInput.SelectedItem).RdNr;
+            a.RdNr = RdInput.SelectedItem.GetType() == typeof(NullItem) ? null : ((WbRd)RdInput.SelectedItem).RdNr;
             a.GstNr = GstNrInput.Text;
             a.Area = int.Parse(AreaInput.Text);
-            a.AreaCom.SortId = ((WineVar)SortInput.SelectedItem).SortId;
-            // FIXME
-            //a.AttrId = ((WineAttr)AttrInput.SelectedItem).AttrId;
-            a.AreaCom.CultId = ((WineCult)CultInput.SelectedItem).CultId;
+            a.SortId = ((WineVar)WineVarietyInput.SelectedItem).SortId;
+            a.CultId = ((WineCult)WineCultivationInput.SelectedItem).CultId;
 
-            EntityEntry<AreaComParcel>? tr = null;
+            EntityEntry<AreaCom>? tr = null;
             try {
                 if (IsEditing) {
                     tr = Context.Update(a);
                 } else if (IsCreating) {
+                    a.FbNr = newFbNr;
                     tr = (await Context.AddAsync(a));
                 }
+
+
+                foreach (WineAttr attr in a.Attributes) {
+                    if (!AttributesInput.SelectedItems.Contains(attr)) {
+                        var aca = a.AttributeEntries.FirstOrDefault(h => h.AttrId == attr.AttrId);
+                        Context.Remove(aca);
+                    }
+                }
+
+                foreach (WineAttr attr in AttributesInput.SelectedItems) {
+                    if (!a.Attributes.Contains(attr)) {
+                        AreaComAttr aca = Context.CreateProxy<AreaComAttr>();
+                        aca.FbNr = a.FbNr;
+                        aca.AttrId = attr.AttrId;
+                        await Context.AddAsync(aca);
+                    }
+                }
+
                 await Context.SaveChangesAsync();
 
+                if (newFbNr != a.FbNr) {
+                    await Context.Database.ExecuteSqlAsync($"UPDATE area_commitment SET fbnr = {newFbNr} WHERE fbnr = {a.FbNr}");
+                    await Context.Members.LoadAsync();
+                    a = await Context.AreaCommitments.FindAsync(newFbNr);
+                }
+
             } catch (Exception exc) {
                 if (tr != null) await tr.ReloadAsync();
                 var str = "Der Eintrag konnte nicht in der Datenbank aktualisiert werden!\n\n" + exc.Message;
@@ -270,26 +202,18 @@ namespace Elwig.Windows {
 
             return a;
         }
-        */
 
         private async void AreaCommitmentSaveButton_Click(object sender, RoutedEventArgs evt) {
-            /*
-            Contract c = await UpdateContract((Contract)ContractList.SelectedItem);
-            AreaComParcel a = await UpdateaAreaComParcel(IsEditing ? (AreaComParcel)AreaCommitmentList.SelectedItem : Context.CreateProxy<AreaComParcel>());
-
+            AreaCom a = await UpdateAreaCom(IsEditing ? (AreaCom)AreaCommitmentList.SelectedItem : Context.CreateProxy<AreaCom>());
             IsEditing = false;
             IsCreating = false;
             AreaCommitmentList.IsEnabled = true;
-            ContractList.IsEnabled = true;
             HideAreaCommitmentSaveResetCancelButtons();
             ShowAreaCommitmentNewEditDeleteButtons();
-            EnableContractNewDeleteButtons();
             LockInputs();
-            await RefreshContractList();
+            AttributesInput.IsEnabled = false;
             await RefreshAreaCommitmentList();
-            ContractList.SelectedItem = c;
             AreaCommitmentList.SelectedItem = a;
-            */
         }
 
         private void AreaCommitmentResetButton_Click(object sender, RoutedEventArgs evt) {
@@ -305,73 +229,19 @@ namespace Elwig.Windows {
             IsEditing = false;
             IsCreating = false;
             AreaCommitmentList.IsEnabled = true;
-            ContractList.IsEnabled = true;
             HideAreaCommitmentSaveResetCancelButtons();
             ShowAreaCommitmentNewEditDeleteButtons();
-            EnableContractNewDeleteButtons();
-            RefreshInputs();
-            ClearInputStates();
-            LockInputs();
-        }
-
-        private async void ContractSaveButton_Click(object sender, RoutedEventArgs evt) {
-            /*
-            Contract c = await UpdateContract(Context.CreateProxy<Contract>());
-            AreaComParcel a = await UpdateaAreaComParcel(Context.CreateProxy<AreaComParcel>());
-
-            IsEditing = false;
-            IsCreating = false;
-            AreaCommitmentList.IsEnabled = true;
-            ContractList.IsEnabled = true;
-            HideContractSaveCancelButtons();
-            ShowContractNewDeleteButtons();
-            EnableAreaCommitmentNewEditDeleteButtons();
-            LockInputs();
-            await RefreshContractList();
-            await RefreshAreaCommitmentList();
-            ContractList.SelectedItem = c;
-            AreaCommitmentList.SelectedItem = a;
-            */
-        }
-
-        private void ContractCancelButton_Click(object sender, RoutedEventArgs evt) {
-            IsEditing = false;
-            IsCreating = false;
-            ContractList.IsEnabled = true;
-            AreaCommitmentList.IsEnabled = true;
-            HideContractSaveCancelButtons();
-            ShowContractNewDeleteButtons();
-            EnableAreaCommitmentNewEditDeleteButtons();
             RefreshInputs();
             ClearInputStates();
             LockInputs();
+            AttributesInput.IsEnabled = false;
         }
 
         override protected void UpdateButtons() {
             if (!IsEditing && !IsCreating) return;
             bool ch = HasChanged, v = IsValid;
-            ContractSaveButton.IsEnabled = (v && ch);
             AreaCommitmentResetButton.IsEnabled = (ch);
-            AreaCommitmentSaveButton.IsEnabled = (v && ch);
-        }
-
-        private async void InitInputs() {
-            /*
-            VNrInput.Text = ContractList.SelectedItem == null ? (await Context.NextVNr()).ToString() : ((Contract)ContractList.SelectedItem).VNr.ToString();
-            MgNrInput.Text = member.MgNr.ToString();
-            FillOriginalValues();
-            ValidateRequiredInputs();
-            */
-        }
-
-        private void EnableContractNewDeleteButtons() {
-            NewContractButton.IsEnabled = true;
-            DeleteContractButton.IsEnabled = ContractList.SelectedItem != null;
-        }
-
-        private void DisableContractNewDeleteButtons() {
-            NewContractButton.IsEnabled = false;
-            DeleteContractButton.IsEnabled = false;
+            AreaCommitmentSaveButton.IsEnabled = (ch && v);
         }
 
         private void DisableAreaCommitmentNewEditDeleteButtons() {
@@ -381,37 +251,11 @@ namespace Elwig.Windows {
         }
 
         private void EnableAreaCommitmentNewEditDeleteButtons() {
-            NewAreaCommitmentButton.IsEnabled = ContractList.SelectedItem != null;
+            NewAreaCommitmentButton.IsEnabled = true;
             EditAreaCommitmentButton.IsEnabled = AreaCommitmentList.SelectedItem != null;
             DeleteAreaCommitmentButton.IsEnabled = AreaCommitmentList.SelectedItem != null;
         }
 
-        private void ShowContractSaveCancelButtons() {
-            ContractSaveButton.IsEnabled = false;
-            ContractCancelButton.IsEnabled = true;
-            ContractSaveButton.Visibility = Visibility.Visible;
-            ContractCancelButton.Visibility = Visibility.Visible;
-        }
-
-        private void HideContractSaveCancelButtons() {
-            ContractSaveButton.IsEnabled = false;
-            ContractCancelButton.IsEnabled = false;
-            ContractSaveButton.Visibility = Visibility.Hidden;
-            ContractCancelButton.Visibility = Visibility.Hidden;
-        }
-
-        private void ShowContractNewDeleteButtons() {
-            EnableContractNewDeleteButtons();
-            NewContractButton.Visibility = Visibility.Visible;
-            DeleteContractButton.Visibility = Visibility.Visible;
-        }
-
-        private void HideContractNewDeleteButtons() {
-            DisableContractNewDeleteButtons();
-            NewContractButton.Visibility = Visibility.Hidden;
-            DeleteContractButton.Visibility = Visibility.Hidden;
-        }
-
         private void ShowAreaCommitmentSaveResetCancelButtons() {
             AreaCommitmentSaveButton.IsEnabled = false;
             AreaCommitmentResetButton.IsEnabled = false;
@@ -444,57 +288,40 @@ namespace Elwig.Windows {
             DeleteAreaCommitmentButton.Visibility = Visibility.Hidden;
         }
 
-        private async void ContractList_SelectionChanged(object sender, SelectionChangedEventArgs evt) {
-            //await RefreshContractListQuery();
-            await RefreshAreaCommitmentList();
-        }
-
         private void AreaCommitmentList_SelectionChanged(object sender, SelectionChangedEventArgs evt) {
             RefreshInputs();
         }
 
-        private void KgInput_SelectionChanged(object sender, SelectionChangedEventArgs evt) {
+        private void AttributesInput_SelectionChanged(object sender, ItemSelectionChangedEventArgs evt) {
+
+        }
+
+        private async void KgInput_SelectionChanged(object sender, SelectionChangedEventArgs evt) {
             AT_Kg? curr_kg = (AT_Kg)KgInput.SelectedItem;
             if (curr_kg != null) {
-                RdInput.ItemsSource = Context.WbRde.Where(r => r.KgNr == curr_kg.KgNr).OrderBy(r => r.Name).ToList();
+                var rdList = await Context.WbRde.Where(r => r.KgNr == curr_kg.KgNr).OrderBy(r => r.Name).Cast<object>().ToListAsync();
+                rdList.Insert(0, new NullItem());
+                Utils.RenewItemsSource(RdInput, rdList, i => (i as WbRd)?.RdNr);
             }
             ComboBox_SelectionChanged(sender, evt);
         }
 
-        /*
-        protected void InputTextChanged(TextBox input, Func<TextBox, bool, AppDbContext, Contract?, ValidationResult> checker) {
-            InputTextChanged(input, checker(input, SenderIsRequired(input), Context, (Contract)ContractList.SelectedItem));
+        protected void InputTextChanged(TextBox input, Func<TextBox, bool, AppDbContext, AreaCom?, ValidationResult> checker) {
+            InputTextChanged(input, checker(input, SenderIsRequired(input), Context, (AreaCom)AreaCommitmentList.SelectedItem));
         }
 
-        protected void InputLostFocus(TextBox input, Func<TextBox, bool, AppDbContext, Contract?, ValidationResult> checker, string? msg = null) {
-            InputLostFocus(input, checker(input, SenderIsRequired(input), Context, (Contract)ContractList.SelectedItem), msg);
-        }
-        */
-
-        private void NumericInput_TextChanged(object sender, RoutedEventArgs evt) {
-            InputTextChanged((TextBox)sender, Validator.CheckInteger);
+        protected void InputLostFocus(TextBox input, Func<TextBox, bool, AppDbContext, AreaCom?, ValidationResult> checker, string? msg = null) {
+            InputLostFocus(input, checker(input, SenderIsRequired(input), Context, (AreaCom)AreaCommitmentList.SelectedItem), msg);
         }
 
-        private void VNrInput_TextChanged(object sender, RoutedEventArgs evt) {
-            /*
-            InputTextChanged((TextBox)sender, Validator.CheckVNr);
-            */
+        private void FbNrInput_TextChanged(object sender, RoutedEventArgs evt) {
+            InputTextChanged((TextBox)sender, Validator.CheckFbNr);
         }
 
-        private void VNrInput_LostFocus(object sender, RoutedEventArgs evt) {
-            /*
-            InputLostFocus((TextBox)sender, Validator.CheckVNr);
-            */
+        private void FbNrInput_LostFocus(object sender, RoutedEventArgs evt) {
+            InputLostFocus((TextBox)sender, Validator.CheckFbNr);
         }
-
-        private void YearFromInput_TextChanged(object sender, RoutedEventArgs evt) {
-            InputTextChanged((TextBox)sender, Validator.CheckInteger);
-        }
-
-        private void YearToInput_TextChanged(object sender, RoutedEventArgs evt) {
-            InputTextChanged((TextBox)sender, Validator.CheckInteger);
-        }
-
+        
         private void GstNrInput_TextChanged(object sender, RoutedEventArgs evt) {
             InputTextChanged((TextBox)sender, Validator.CheckGstNr);
         }
@@ -502,9 +329,5 @@ namespace Elwig.Windows {
         private void GstNrInput_LostFocus(object sender, RoutedEventArgs evt) {
             InputLostFocus((TextBox)sender, Validator.CheckGstNr);
         }
-
-        private void AreaInput_TextChanged(object sender, RoutedEventArgs evt) {
-            InputTextChanged((TextBox)sender, Validator.CheckInteger);
-        }
     }
 }