diff --git a/Elwig/App.xaml b/Elwig/App.xaml
index bba2122..e351b55 100644
--- a/Elwig/App.xaml
+++ b/Elwig/App.xaml
@@ -84,6 +84,12 @@
             </DataTemplate.Triggers>
         </DataTemplate>
 
+        <DataTemplate x:Key="WineOriginTemplate">
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="{Binding HkIdLevel}" MinWidth="70" Margin="0,0,10,0"/>
+                <TextBlock Text="{Binding Name}"/>
+            </StackPanel>
+        </DataTemplate>
         <ControlTemplate x:Key="WineOriginTemplateSimple">
             <StackPanel Orientation="Horizontal">
                 <TextBlock Text="{Binding Name}"/>
@@ -95,7 +101,7 @@
                 <TextBlock Text="{Binding Name}"/>
             </StackPanel>
         </ControlTemplate>
-        <DataTemplate x:Key="WineOriginTemplate">
+        <DataTemplate x:Key="WineOriginComboTemplate">
             <Control x:Name="Control" Focusable="False" Template="{StaticResource WineOriginTemplateExtended}"/>
             <DataTemplate.Triggers>
                 <DataTrigger Binding="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type ComboBoxItem}}, Path=IsSelected}" Value="{x:Null}">
@@ -103,5 +109,31 @@
                 </DataTrigger>
             </DataTemplate.Triggers>
         </DataTemplate>
+
+        <DataTemplate x:Key="GemTemplate">
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Text="{Binding Name}"/>
+                <TextBlock Text="{Binding Gkz, StringFormat='{} ({0:00000})'}"/>
+            </StackPanel>
+        </DataTemplate>
+
+        <DataTemplate x:Key="WbKgTemplate">
+            <StackPanel Orientation="Horizontal" HorizontalAlignment="Center">
+                <TextBlock Width="250">
+                    <TextBlock Text="{Binding Name}"/>
+                    <TextBlock Text="{Binding KgNr, StringFormat='{}({0:00000})'}"/>
+                </TextBlock>
+                <TextBlock Text="{Binding Gem.WbGem.Origin.Name}"/>
+            </StackPanel>
+        </DataTemplate>
+        <DataTemplate x:Key="WbKgGlTemplate">
+            <StackPanel Orientation="Horizontal">
+                <TextBlock Width="220">
+                    <TextBlock Text="{Binding Name}"/>
+                    <TextBlock Text="{Binding KgNr, StringFormat='{}({0:00000})'}"/>
+                </TextBlock>
+                <TextBlock Text="{Binding WbKg.Gl.Name}"/>
+            </StackPanel>
+        </DataTemplate>
     </Application.Resources>
 </Application>
diff --git a/Elwig/App.xaml.cs b/Elwig/App.xaml.cs
index 23d2767..2c78bf4 100644
--- a/Elwig/App.xaml.cs
+++ b/Elwig/App.xaml.cs
@@ -15,6 +15,7 @@ using System.Reflection;
 using Elwig.Helpers.Printing;
 using Elwig.Windows;
 using Elwig.Dialogs;
+using System.Threading.Tasks;
 
 namespace Elwig {
     public partial class App : Application {
@@ -175,6 +176,13 @@ namespace Elwig {
             }
         }
 
+        public static async Task HintContextChange() {
+            foreach (Window w in CurrentApp.Windows) {
+                if (w is not ContextWindow c) continue;
+                await c.HintContextChange();
+            }
+        }
+
         private static T FocusWindow<T>(Func<T> constructor, Predicate<T>? selector = null) where T : Window {
             foreach (Window w in CurrentApp.Windows) {
                 if (w is T t && (selector == null || selector(t))) {
@@ -218,5 +226,15 @@ namespace Elwig {
         public static DeliveryConfirmationsWindow FocusDeliveryConfirmations(int year) {
             return FocusWindow<DeliveryConfirmationsWindow>(() => new(year), w => w.Year == year);
         }
+
+        public static OriginHierarchyWindow FocusOriginHierarchy() {
+            return FocusWindow<OriginHierarchyWindow>(() => new());
+        }
+
+        public static OriginHierarchyWindow FocusOriginHierarchyKg(int kgnr) {
+            var w = FocusOriginHierarchy();
+            w.FocusKgNr(kgnr);
+            return w;
+        }
     }
 }
diff --git a/Elwig/Helpers/AppDbContext.cs b/Elwig/Helpers/AppDbContext.cs
index cb28a14..b0f8071 100644
--- a/Elwig/Helpers/AppDbContext.cs
+++ b/Elwig/Helpers/AppDbContext.cs
@@ -27,6 +27,8 @@ namespace Elwig.Helpers {
         public DbSet<WineVar> WineVarieties { get; private set; }
 
         public DbSet<ClientParam> ClientParameters { get; private set; }
+        public DbSet<WbGl> WbGls { get; private set; }
+        public DbSet<WbGem> WbGems { get; private set; }
         public DbSet<WbKg> WbKgs { get; private set; }
         public DbSet<WbRd> WbRde { get; private set; }
         public DbSet<WineAttr> WineAttributes { get; private set; }
diff --git a/Elwig/Helpers/ControlUtils.cs b/Elwig/Helpers/ControlUtils.cs
index b196505..47c1a3d 100644
--- a/Elwig/Helpers/ControlUtils.cs
+++ b/Elwig/Helpers/ControlUtils.cs
@@ -183,6 +183,15 @@ namespace Elwig.Helpers {
             SelectComboBoxItem(cb, getId, getId(item));
         }
 
+        public static void SelectListBoxItem(ListBox lb, Func<object?, object?> getId, object? id) {
+            lb.SelectedItem = GetItemFromSource(lb.ItemsSource, getId, id);
+            lb.ScrollIntoView(lb.SelectedItem);
+        }
+
+        public static void SelectListBoxItem(ListBox lb, object? item, Func<object?, object?> getId) {
+            SelectListBoxItem(lb, getId, getId(item));
+        }
+
         public static IEnumerable<object?> GetItemsFromSource(IEnumerable source, Func<object?, object?> getId, IEnumerable<object?> ids) {
             if (source == null)
                 return Array.Empty<object>();
diff --git a/Elwig/Models/Entities/AT_Kg.cs b/Elwig/Models/Entities/AT_Kg.cs
index fd96035..0a2191e 100644
--- a/Elwig/Models/Entities/AT_Kg.cs
+++ b/Elwig/Models/Entities/AT_Kg.cs
@@ -17,6 +17,6 @@ namespace Elwig.Models.Entities {
         public virtual AT_Gem Gem { get; private set; }
 
         [InverseProperty("AtKg")]
-        public virtual WbKg WbKg { get; private set; }
+        public virtual WbKg? WbKg { get; private set; }
     }
 }
diff --git a/Elwig/Windows/AdministrationWindow.cs b/Elwig/Windows/AdministrationWindow.cs
index a946daa..4331253 100644
--- a/Elwig/Windows/AdministrationWindow.cs
+++ b/Elwig/Windows/AdministrationWindow.cs
@@ -573,10 +573,6 @@ namespace Elwig.Windows {
             InputLostFocus((TextBox)sender, Validator.CheckUpperCase);
         }
 
-        protected void KgDetailsButton_Click(object sender, RoutedEventArgs evt) {
-            // TODO open origin window
-        }
-
         protected void AreaComTypeDetailsButton_Click(object sender, RoutedEventArgs evt) {
             App.FocusBaseDataAreaComType();
         }
diff --git a/Elwig/Windows/AreaComAdminWindow.xaml.cs b/Elwig/Windows/AreaComAdminWindow.xaml.cs
index 7029974..3f5e6e5 100644
--- a/Elwig/Windows/AreaComAdminWindow.xaml.cs
+++ b/Elwig/Windows/AreaComAdminWindow.xaml.cs
@@ -401,6 +401,14 @@ namespace Elwig.Windows {
             ComboBox_SelectionChanged(sender, evt);
         }
 
+        private void KgDetailsButton_Click(object sender, RoutedEventArgs evt) {
+            if (KgInput.SelectedItem is AT_Kg kg) {
+                App.FocusOriginHierarchyKg(kg.KgNr);
+            } else {
+                App.FocusOriginHierarchy();
+            }
+        }
+
         private void RdInput_SelectionChanged(object sender, SelectionChangedEventArgs evt) {
             RdAddButton.IsEnabled = RdInput.SelectedIndex == -1;
         }
diff --git a/Elwig/Windows/BaseDataWindow.xaml b/Elwig/Windows/BaseDataWindow.xaml
index 805fa97..ee96be4 100644
--- a/Elwig/Windows/BaseDataWindow.xaml
+++ b/Elwig/Windows/BaseDataWindow.xaml
@@ -545,6 +545,10 @@
             </TabItem>
         </TabControl>
 
+        <Button x:Name="OriginButton" Content="Herkunftshierarchie"
+                HorizontalAlignment="Right" VerticalAlignment="Bottom" Margin="10,10,10,10" Width="150"
+                Click="OriginButton_Click"/>
+
         <Button x:Name="EditButton" Content="Bearbeiten"
                 HorizontalAlignment="Center" VerticalAlignment="Bottom" Margin="0,0,0,10" Width="120"
                 Click="EditButton_Click"/>
diff --git a/Elwig/Windows/BaseDataWindow.xaml.cs b/Elwig/Windows/BaseDataWindow.xaml.cs
index ce52652..a6d8f96 100644
--- a/Elwig/Windows/BaseDataWindow.xaml.cs
+++ b/Elwig/Windows/BaseDataWindow.xaml.cs
@@ -167,6 +167,10 @@ namespace Elwig.Windows {
             SeasonModifierDeleteButton.IsEnabled = SeasonModifierList.SelectedIndex != -1;
         }
 
+        private void OriginButton_Click(object sender, RoutedEventArgs evt) {
+            App.FocusOriginHierarchy();
+        }
+
         private void EditButton_Click(object sender, RoutedEventArgs evt) {
             IsEditing = true;
             EditButton.Visibility = Visibility.Hidden;
diff --git a/Elwig/Windows/ContextWindow.cs b/Elwig/Windows/ContextWindow.cs
index 0761371..1a8c732 100644
--- a/Elwig/Windows/ContextWindow.cs
+++ b/Elwig/Windows/ContextWindow.cs
@@ -24,14 +24,18 @@ namespace Elwig.Windows {
             Loaded += OnLoaded;
         }
 
-        private async void OnShouldRenewContext(object? sender, EventArgs evt) {
-            if (!Context.HasBackendChanged) return;
+        public async Task HintContextChange() {
             _renewPending = true;
             if (LockContext) return;
             await RenewContext();
         }
 
-        protected async void OnLoaded(object sender, RoutedEventArgs evt) {
+        private async void OnShouldRenewContext(object? sender, EventArgs? evt) {
+            if (!Context.HasBackendChanged) return;
+            await HintContextChange();
+        }
+
+        protected async void OnLoaded(object? sender, RoutedEventArgs? evt) {
             await OnRenewContext();
         }
 
diff --git a/Elwig/Windows/DeliveryAdminWindow.xaml b/Elwig/Windows/DeliveryAdminWindow.xaml
index 7a9983e..aceda2d 100644
--- a/Elwig/Windows/DeliveryAdminWindow.xaml
+++ b/Elwig/Windows/DeliveryAdminWindow.xaml
@@ -417,7 +417,7 @@
 
                     <Label Content="Weinbaugebiet:" Margin="10,10,0,10" Grid.Column="0"/>
                     <ComboBox x:Name="WineOriginInput" Margin="0,10,10,10" Grid.Column="1"
-                              ItemTemplate="{StaticResource WineOriginTemplate}"/>
+                              ItemTemplate="{StaticResource WineOriginComboTemplate}"/>
 
                     <Label Content="Weinbau-KG:" Margin="10,40,0,10" Grid.Column="0"/>
                     <ComboBox x:Name="WineKgInput" Margin="0,40,10,10" Grid.Column="1"
diff --git a/Elwig/Windows/MemberAdminWindow.xaml.cs b/Elwig/Windows/MemberAdminWindow.xaml.cs
index 0f5629e..6d7ff0b 100644
--- a/Elwig/Windows/MemberAdminWindow.xaml.cs
+++ b/Elwig/Windows/MemberAdminWindow.xaml.cs
@@ -672,5 +672,13 @@ namespace Elwig.Windows {
             base.PhoneNrInput_TextChanged(sender, evt);
             UpdatePhoneNrInputVisibility(IsEditing || IsCreating);
         }
+
+        private void KgDetailsButton_Click(object sender, RoutedEventArgs evt) {
+            if (DefaultKgInput.SelectedItem is AT_Kg kg) {
+                App.FocusOriginHierarchyKg(kg.KgNr);
+            } else {
+                App.FocusOriginHierarchy();
+            }
+        }
     }
 }
diff --git a/Elwig/Windows/OriginHierarchyWindow.xaml b/Elwig/Windows/OriginHierarchyWindow.xaml
new file mode 100644
index 0000000..79cdc72
--- /dev/null
+++ b/Elwig/Windows/OriginHierarchyWindow.xaml
@@ -0,0 +1,74 @@
+<local:ContextWindow
+        x:Class="Elwig.Windows.OriginHierarchyWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+        xmlns:local="clr-namespace:Elwig.Windows"
+        mc:Ignorable="d"
+        Title="Herkunftshierarchie - Elwig" Height="800" Width="1200" MinHeight="500" MinWidth="1000">
+    <Grid>
+        <Grid.ColumnDefinitions>
+            <ColumnDefinition Width="1*" MinWidth="300"/>
+            <ColumnDefinition Width="25"/>
+            <ColumnDefinition Width="1*"/>
+            <ColumnDefinition Width="25"/>
+            <ColumnDefinition Width="1*" MinWidth="400"/>
+            <ColumnDefinition Width="25"/>
+            <ColumnDefinition Width="1*"/>
+        </Grid.ColumnDefinitions>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="1*"/>
+            <RowDefinition Height="25"/>
+            <RowDefinition Height="1*"/>
+        </Grid.RowDefinitions>
+
+        <Label Content="Weinbaugebiete" Margin="10,0,0,0" VerticalAlignment="Top" Grid.RowSpan="3"/>
+        <ListBox x:Name="WineOrigins" Margin="10,25,0,10" Grid.RowSpan="3"
+                 ItemTemplate="{StaticResource WineOriginTemplate}"
+                 SelectionChanged="WineOrigins_SelectionChanged"/>
+
+        <Label Content="Großlagen" Margin="0,0,0,0" VerticalAlignment="Top" Grid.Column="2"/>
+        <ListBox x:Name="WbGls" Margin="0,25,0,5" Grid.Column="2"
+                 DisplayMemberPath="Name"
+                 SelectionChanged="WbGls_SelectionChanged"/>
+
+        <Label Content="&#xF0AF;" FontFamily="Segoe MDL2 Assets" FontSize="16" Padding="0" Grid.Row="2" Grid.Column="1"
+               VerticalAlignment="Center" HorizontalAlignment="Center"/>
+        <Label x:Name="WbGemsHeader" Content="Gemeinden" Margin="0,0,0,0" VerticalAlignment="Top" Grid.Column="2" Grid.Row="2"/>
+        <ListBox x:Name="WbGems" Margin="0,25,0,10" Grid.Column="2" Grid.Row="2"
+                 ItemTemplate="{StaticResource GemTemplate}" TextSearch.TextPath="Name"
+                 SelectionChanged="WbGems_SelectionChanged"/>
+
+        <Label Content="&#xF0AF;" FontFamily="Segoe MDL2 Assets" FontSize="16" Padding="0" Grid.Column="3"
+               VerticalAlignment="Center" HorizontalAlignment="Center"/>
+        <Label x:Name="WbGlKgsHeader" Content="Aktive KG" Margin="0,0,0,0" VerticalAlignment="Top" Grid.Column="4"/>
+        <Label Content="Weinbaugebiet" Margin="250,0,0,0" VerticalAlignment="Top" Grid.Column="4" Background="White"/>
+        <ListBox x:Name="WbGlKgs" Margin="0,25,0,5" Grid.Column="4"
+                 ItemTemplate="{StaticResource WbKgTemplate}" TextSearch.TextPath="Name"
+                 SelectionChanged="WbGlKgs_SelectionChanged"/>
+
+        <Button x:Name="ActivateKgButton" Content="&#xF0AD;" Grid.Column="4" Grid.Row="1" Height="25" Width="25" Margin="0,0,30,0"
+                FontFamily="Segoe MDL2 Assets" FontSize="14"
+                Click="ActivateKgButton_Click"
+                VerticalAlignment="Center" HorizontalAlignment="Center"/>
+        <Button x:Name="DeactivateKgButton" Content="&#xF0AE;" Grid.Column="4" Grid.Row="1" Height="25" Width="25" Margin="30,0,0,0"
+                FontFamily="Segoe MDL2 Assets" FontSize="14"
+                Click="DeactivateKgButton_Click"
+                VerticalAlignment="Center" HorizontalAlignment="Center"/>
+
+        <Label Content="&#xF0AF;" FontFamily="Segoe MDL2 Assets" FontSize="16" Padding="0" Grid.Row="2" Grid.Column="3"
+               VerticalAlignment="Center" HorizontalAlignment="Center"/>
+        <Label x:Name="WbKgsHeader" Content="Verfügbare KG" Margin="0,0,0,0" VerticalAlignment="Top" Grid.Column="4" Grid.Row="2"/>
+        <Label Content="Zugewiesen zu Großlage" Margin="220,0,0,0" VerticalAlignment="Top" Grid.Column="4" Grid.Row="2" Background="White"/>
+        <ListBox x:Name="WbKgs" Margin="0,25,0,10" Grid.Column="4" Grid.Row="2"
+                 ItemTemplate="{StaticResource WbKgGlTemplate}" TextSearch.TextPath="Name"
+                 SelectionChanged="WbKgs_SelectionChanged"/>
+
+        <Label Content="&#xF0AF;" FontFamily="Segoe MDL2 Assets" FontSize="16" Padding="0" Grid.Column="5"
+               VerticalAlignment="Center" HorizontalAlignment="Center"/>
+        <Label x:Name="WbRdsHeader" Content="Riede" Margin="0,0,0,0" VerticalAlignment="Top" Grid.Column="6" Grid.RowSpan="3"/>
+        <ListBox x:Name="WbRds" Margin="0,25,10,10" Grid.Column="6" Grid.RowSpan="3"
+                 DisplayMemberPath="Name" TextSearch.TextPath="Name"/>
+    </Grid>
+</local:ContextWindow>
diff --git a/Elwig/Windows/OriginHierarchyWindow.xaml.cs b/Elwig/Windows/OriginHierarchyWindow.xaml.cs
new file mode 100644
index 0000000..6fee117
--- /dev/null
+++ b/Elwig/Windows/OriginHierarchyWindow.xaml.cs
@@ -0,0 +1,184 @@
+using Elwig.Helpers;
+using Elwig.Models.Entities;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.ChangeTracking;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+
+namespace Elwig.Windows {
+
+    public partial class OriginHierarchyWindow : ContextWindow {
+
+        private bool isUpdating = false;
+
+        public OriginHierarchyWindow() {
+            InitializeComponent();
+            ActivateKgButton.IsEnabled = false;
+            DeactivateKgButton.IsEnabled = false;
+        }
+
+        protected override async Task OnRenewContext() {
+            ControlUtils.RenewItemsSource(WineOrigins, (await Context.WineOrigins.ToListAsync()).OrderByDescending(o => o.SortKey).ThenBy(o => o.HkId), i => (i as WineOrigin)?.HkId, WineOrigins_SelectionChanged);
+            if (WineOrigins.SelectedItem == null) {
+                var hkid = await Context.WbKgs
+                    .GroupBy(k => k.AtKg.Gem.WbGem.HkId)
+                    .Where(g => g.Count() > 0)
+                    .OrderByDescending(g => g.Count())
+                    .Select(g => g.Key)
+                    .FirstOrDefaultAsync();
+                ControlUtils.SelectListBoxItem(WineOrigins, o => (o as WineOrigin)?.HkId, hkid);
+            }
+            ControlUtils.RenewItemsSource(WbGls, await Context.WbGls.OrderBy(g => g.GlNr).ToListAsync(), g => (g as WbGl)?.GlNr, WbGls_SelectionChanged, ControlUtils.RenewSourceDefault.First);
+            await UpdateWbGems();
+            await UpdateWbKgs();
+            await UpdateWbGlKgs();
+            await UpdateWbRds();
+        }
+
+        private async Task UpdateWbGems() {
+            WbGemsHeader.Content = "Gemeinden" + (WineOrigins.SelectedItem is WineOrigin o ? $" ({o.Name})" : "");
+            var selHkId = (WineOrigins.SelectedItem as WineOrigin)?.HkId;
+            ControlUtils.RenewItemsSource(WbGems, await Context.WbGems.Where(g => g.HkId == selHkId).Select(g => g.AtGem).OrderBy(g => g.Name).ToListAsync(), g => (g as AT_Gem)?.Gkz, WbGems_SelectionChanged);
+            await UpdateWbKgs();
+        }
+
+        private async Task UpdateWbKgs() {
+            WbKgsHeader.Content = "Verfügbare KG";
+            IQueryable<AT_Kg>? kgs = null;
+            if (WbGems.SelectedItem is AT_Gem g) {
+                WbKgsHeader.Content += $" ({g.Name})";
+                kgs = Context.Katastralgemeinden.Where(k => k.Gkz == g.Gkz);
+            } else if (WineOrigins.SelectedItem is WineOrigin o) {
+                WbKgsHeader.Content += $" ({o.Name})";
+                kgs = Context.WbGems.Where(g => g.HkId == o.HkId).SelectMany(g => g.AtGem.Kgs);
+            } else {
+                kgs = null;
+            }
+            if (kgs == null) {
+                WbKgs.ItemsSource = null;
+            } else {
+                ControlUtils.RenewItemsSource(WbKgs, await kgs.OrderBy(k => k.WbKg.Gl == null).ThenBy(k => k.WbKg.GlNr).ThenBy(k => k.Name).ToListAsync(), k => (k as AT_Kg)?.KgNr, WbKgs_SelectionChanged);
+            }
+        }
+
+        private async Task UpdateWbGlKgs() {
+            WbGlKgsHeader.Content = "Aktive KG";
+            if (WbGls.SelectedItem is WbGl g) {
+                WbGlKgsHeader.Content += $" ({g.Name})";
+                ControlUtils.RenewItemsSource(WbGlKgs, await Context.WbKgs.Where(k => k.GlNr == g.GlNr).Select(k => k.AtKg).OrderBy(k => k.Name).ToListAsync(), k => (k as AT_Kg)?.KgNr, WbGlKgs_SelectionChanged);
+            } else {
+                WbGlKgs.ItemsSource = null;
+            }
+            UpdateButtons();
+        }
+
+        private async Task UpdateWbRds() {
+            WbRdsHeader.Content = "Riede";
+            if (WbGlKgs.SelectedItem is AT_Kg k) {
+                WbRdsHeader.Content += $" ({k.Name})";
+                ControlUtils.RenewItemsSource(WbRds, await Context.WbRde.Where(r => r.KgNr == k.KgNr).OrderBy(r => r.Name).ToListAsync(), k => (k as AT_Kg)?.KgNr);
+            } else {
+                WbRds.ItemsSource = null;
+            }
+            UpdateButtons();
+        }
+
+        private async void WineOrigins_SelectionChanged(object sender, SelectionChangedEventArgs evt) {
+            await UpdateWbGems();
+        }
+
+        private async void WbGls_SelectionChanged(object? sender, SelectionChangedEventArgs? e) {
+            await UpdateWbGlKgs();
+        }
+
+        private async void WbGems_SelectionChanged(object? sender, SelectionChangedEventArgs? e) {
+            await UpdateWbKgs();
+        }
+
+        private async void WbGlKgs_SelectionChanged(object sender, SelectionChangedEventArgs e) {
+            await UpdateWbRds();
+            if (!isUpdating && WbGlKgs.SelectedItem is AT_Kg k) {
+                isUpdating = true;
+                ControlUtils.SelectListBoxItem(WineOrigins, o => (o as WineOrigin)?.HkId, k.Gem.WbGem?.HkId);
+                ControlUtils.SelectListBoxItem(WbGems, g => (g as AT_Gem)?.Gkz, k.Gkz);
+                ControlUtils.SelectListBoxItem(WbKgs, k => (k as AT_Kg)?.KgNr, k.KgNr);
+                isUpdating = false;
+            }
+        }
+
+        private void WbKgs_SelectionChanged(object sender, SelectionChangedEventArgs e) {
+            UpdateButtons();
+            if (!isUpdating && WbKgs.SelectedItem is AT_Kg k && k.WbKg != null && ((WbGls.SelectedItem as WbGl)?.GlNr == k.WbKg?.GlNr || WbGls.SelectedItem == null)) {
+                isUpdating = true;
+                ControlUtils.SelectListBoxItem(WbGls, g => (g as WbGl)?.GlNr, k.WbKg?.GlNr);
+                ControlUtils.SelectListBoxItem(WbGlKgs, k => (k as AT_Kg)?.KgNr, k.KgNr);
+                isUpdating = false;
+            }
+        }
+
+        private void UpdateButtons() {
+            if (WbKgs.SelectedItem is AT_Kg v) {
+                ActivateKgButton.IsEnabled = v.WbKg?.GlNr != (WbGls.SelectedItem as WbGl)?.GlNr;
+                ActivateKgButton.ToolTip = $"KG {v.Name} Großlage {(WbGls.SelectedItem as WbGl)?.Name} zuweisen";
+            } else {
+                ActivateKgButton.IsEnabled = false;
+                ActivateKgButton.ToolTip = $"Verfügbare Katastralgemeinde Großlage {(WbGls.SelectedItem as WbGl)?.Name} zuweisen";
+            }
+
+            if (WbGlKgs.SelectedItem is AT_Kg a) {
+                DeactivateKgButton.IsEnabled = true;
+                DeactivateKgButton.ToolTip = $"KG {a.Name} deaktivieren";
+            } else {
+                DeactivateKgButton.IsEnabled = false;
+                DeactivateKgButton.ToolTip = "Aktive Katastralgemeinde deaktivieren";
+            }
+        }
+
+        private async void ActivateKgButton_Click(object sender, RoutedEventArgs e) {
+            if (WbKgs.SelectedItem is not AT_Kg k || WbGls.SelectedItem is not WbGl g) return;
+            try {
+                if (k.WbKg != null) {
+                    k.WbKg.GlNr = g.GlNr;
+                    Context.Update(k.WbKg);
+                } else {
+                    var wbKg = Context.CreateProxy<WbKg>();
+                    wbKg.KgNr = k.KgNr;
+                    wbKg.GlNr = g.GlNr;
+                    await Context.AddAsync(wbKg);
+                }
+                await Context.SaveChangesAsync();
+                await App.HintContextChange();
+                ControlUtils.SelectListBoxItem(WbGlKgs, kg => (kg as AT_Kg)?.KgNr, k.KgNr);
+            } catch (Exception exc) {
+                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, "Katastralgemeinde aktivieren", MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+        }
+
+        private async void DeactivateKgButton_Click(object sender, RoutedEventArgs e) {
+            if (WbGlKgs.SelectedItem is not AT_Kg k || k.WbKg == null) return;
+            try {
+                Context.Remove(k.WbKg);
+                await Context.SaveChangesAsync();
+                await App.HintContextChange();
+                ControlUtils.SelectListBoxItem(WbKgs, kg => (kg as AT_Kg)?.KgNr, k.KgNr);
+            } catch (Exception exc) {
+                await HintContextChange();
+                var str = "Der Eintrag konnte nicht aus der Datenbank gelöscht werden!\n\n" + exc.Message;
+                if (exc.InnerException != null) str += "\n\n" + exc.InnerException.Message;
+                MessageBox.Show(str, "Katastralgemeinde deaktivieren", MessageBoxButton.OK, MessageBoxImage.Error);
+            }
+        }
+
+        public void FocusKgNr(int kgnr) {
+            var kg = Context.Katastralgemeinden.Find(kgnr);
+            ControlUtils.SelectListBoxItem(WbGls, kg.WbKg.Gl, g => (g as WbGl)?.GlNr);
+            ControlUtils.SelectListBoxItem(WbGlKgs, kg, k => (k as AT_Kg)?.KgNr);
+            WbGlKgs.Focus();
+        }
+    }
+}