Add repro

Author: wieslawsoltes

samples/BehaviorsTestApplication/ViewModels/MainWindowViewModel.cs

@@ -21,6 +21,8 @@ public partial class MainWindowViewModel : ViewModelBase
 
     public IObservable<int> Values { get; }
 
+    public ICommand InitializeCommand { get; set; }
+
     public ICommand MoveLeftCommand { get; set; }
 
     public ICommand MoveRightCommand { get; set; }
@@ -31,6 +33,8 @@ public MainWindowViewModel()
     {
         Count = 0;
         Position = 100.0;
+        InitializeCommand = ReactiveCommand.Create(Initialize);
+        MoveLeftCommand = ReactiveCommand.Create(() => Position -= 5.0);
         MoveLeftCommand = ReactiveCommand.Create(() => Position -= 5.0);
         MoveRightCommand = ReactiveCommand.Create(() => Position += 5.0);
         ResetMoveCommand = ReactiveCommand.Create(() => Position = 100.0);
@@ -89,6 +93,11 @@ public MainWindowViewModel()
         Values = Observable.Interval(TimeSpan.FromSeconds(1)).Select(_ => _value++);
     }
 
+    private void Initialize()
+    {
+        Console.WriteLine("InitializeCommand");
+    }
+
     public void IncrementCount() => Count++;
 
     public void DecrementCount(object? sender, object parameter) => Count--;

samples/BehaviorsTestApplication/Views/MainWindow.axaml

@@ -1,7 +1,15 @@
 <Window x:Class="BehaviorsTestApplication.Views.MainWindow"
         xmlns="https://github.com/avaloniaui"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="using:BehaviorsTestApplication.ViewModels"
         xmlns:views="using:BehaviorsTestApplication.Views"
-        Title="XamlBehaviors Test Application" Width="1000" Height="700">
+        Title="XamlBehaviors Test Application" Width="1000" Height="700"
+        x:DataType="vm:MainWindowViewModel"
+        x:CompileBindings="False">
+  <Interaction.Behaviors>
+    <EventTriggerBehavior EventName="Opened">
+      <InvokeCommandAction Command="{Binding InitializeCommand, Mode=OneTime}" />
+    </EventTriggerBehavior>
+  </Interaction.Behaviors>
   <views:MainView />
 </Window>