diff --git a/Elwig/Elwig.csproj b/Elwig/Elwig.csproj
index 2984920..5fc7de6 100644
--- a/Elwig/Elwig.csproj
+++ b/Elwig/Elwig.csproj
@@ -14,15 +14,14 @@
   </ItemGroup>
 
   <ItemGroup>
+    <PackageReference Include="Extended.Wpf.Toolkit" Version="4.5.0" />
     <PackageReference Include="ini-parser" Version="2.5.2" />
-    <PackageReference Include="Microsoft.AspNetCore.Razor" Version="2.2.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.2.0" />
     <PackageReference Include="Microsoft.AspNetCore.Razor.Language" Version="6.0.16" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="7.0.5" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="7.0.5" />
-    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.1722.45" />
+    <PackageReference Include="Microsoft.Web.WebView2" Version="1.0.1774.30" />
     <PackageReference Include="PdfSharp" Version="1.50.5147" />
-    <PackageReference Include="PuppeteerSharp" Version="9.1.0" />
+    <PackageReference Include="PuppeteerSharp" Version="10.0.0" />
     <PackageReference Include="RazorLight" Version="2.3.1" />
     <PackageReference Include="System.IO.Ports" Version="7.0.0" />
     <PackageReference Include="System.Text.Encoding.CodePages" Version="7.0.0" />
diff --git a/Elwig/Windows/MainWindow.xaml b/Elwig/Windows/MainWindow.xaml
index 8e010ac..c031b16 100644
--- a/Elwig/Windows/MainWindow.xaml
+++ b/Elwig/Windows/MainWindow.xaml
@@ -44,5 +44,7 @@
                 Margin="50,200,0,0" VerticalAlignment="Top" HorizontalAlignment="Left"/>
         <Button x:Name="Button4" Content="PDF Erzeugen" Click="Button4_Click" Tag="Print"
                 Margin="50,240,0,0" VerticalAlignment="Top" HorizontalAlignment="Left"/>
+        <Button x:Name="TestWindowButton" Content="Test Fenster" Click="TestWindowButton_Click"
+                Margin="50,280,0,0" VerticalAlignment="Top" HorizontalAlignment="Left"/>
     </Grid>
 </Window>
diff --git a/Elwig/Windows/MainWindow.xaml.cs b/Elwig/Windows/MainWindow.xaml.cs
index 8ea3137..a1222aa 100644
--- a/Elwig/Windows/MainWindow.xaml.cs
+++ b/Elwig/Windows/MainWindow.xaml.cs
@@ -33,5 +33,10 @@ namespace Elwig.Windows {
                 doc.Show();
             });
         }
+
+        private void TestWindowButton_Click(object sender, RoutedEventArgs evt) {
+            var w = new TestWindow();
+            w.Show();
+        }
     }
 }
diff --git a/Elwig/Windows/TestWindow.xaml b/Elwig/Windows/TestWindow.xaml
new file mode 100644
index 0000000..f233770
--- /dev/null
+++ b/Elwig/Windows/TestWindow.xaml
@@ -0,0 +1,16 @@
+<Window x:Class="Elwig.Windows.TestWindow"
+        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"
+        xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
+        Title="Test Fenster - Elwig" MinHeight="400" MinWidth="325" Height="450" Width="800" ResizeMode="CanResize">
+    <Grid>
+        <xctk:CheckComboBox x:Name="_combo" Width="200"
+                            HorizontalAlignment="Center"
+                            VerticalAlignment="Center"
+                            SelectedValue="{Binding SelectedValue}"
+                            SelectedItemsOverride="{Binding SelectedItems}"/>
+    </Grid>
+</Window>
diff --git a/Elwig/Windows/TestWindow.xaml.cs b/Elwig/Windows/TestWindow.xaml.cs
new file mode 100644
index 0000000..4925815
--- /dev/null
+++ b/Elwig/Windows/TestWindow.xaml.cs
@@ -0,0 +1,10 @@
+using System.Windows;
+
+namespace Elwig.Windows {
+    public partial class TestWindow : Window {
+        public TestWindow() {
+            InitializeComponent();
+            _combo.ItemsSource = new string[] { "Klasse A", "Klasse B", "Klasse C", "Klasse D", "Klasse E", "Klasse F" };
+        }
+    }
+}