MenuView created and tested

Project.View/MainWindow.axaml

@@ -5,5 +5,9 @@
         mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
         x:Class="Project.View.MainWindow"
         Title="Project.View">
-    Welcome to Avalonia!
-</Window>
+
+        <Grid Name="MainGrid">
+            
+        </Grid>
+        
+    </Window>

Project.View/MainWindow.axaml.cs

@@ -7,5 +7,6 @@ public partial class MainWindow : Window
     public MainWindow()
     {
         InitializeComponent();
+        MainGrid.Children.Add(new MenuView());
     }
 }

Project.View/MenuView/MenuView.axaml

@@ -0,0 +1,17 @@
+<UserControl 
+        xmlns="https://github.com/avaloniaui"
+        x:Class="Project.View.MenuView"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
+    <Grid>
+
+        <StackPanel>
+            <Button Click="Button_Click" Width="250" Height="100" Content="XAMPEPE0" />
+            <Button Width="250" Height="100" Content="XAMPEPE2" />
+            <Button Width="250" Height="100" Content="XAMPEPE3" />
+            <Button Width="250" Height="100" Content="XAMPEPE4" />
+        </StackPanel>
+
+    </Grid>
+
+
+</UserControl>

Project.View/MenuView/MenuView.axaml.cs

@@ -0,0 +1,23 @@
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Media;
+
+namespace Project.View;
+
+public partial class MenuView : UserControl
+{
+    public MenuView()
+    {
+        InitializeComponent();
+        // Das ist der Workaround, falls unten nicht funktioniert:
+        //this.FindControl<Grid>("mainGrid").Children.Add(new Menu());
+
+        //funktioniert manchmal nicht!
+        //MainGrid.Children.Add(new Menu())
+    }
+
+    private void Button_Click(object? sender, RoutedEventArgs e)
+    {
+        ((Button)sender).Background = Brushes.Blue;
+    }
+}

README.md

@@ -1,2 +1,2 @@
 # Project_CS
-
+C# project 2nd semester.