restore app.xaml.cs

samples/ControlCatalog/App.xaml.cs

@@ -1,33 +1,23 @@
-using System;
-using System.Reactive;
 using Avalonia;
-using Avalonia.Controls;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
-using ReactiveUI;
 
 namespace ControlCatalog
 {
     public class App : Application
     {
-        public App()
-        {
-        }
-
         public override void Initialize()
         {
             AvaloniaXamlLoader.Load(this);
         }
 
-        public ReactiveCommand<Unit, Unit> AboutCommand { get; }
-
         public override void OnFrameworkInitializationCompleted()
         {
             if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktopLifetime)
                 desktopLifetime.MainWindow = new MainWindow();
             else if (ApplicationLifetime is ISingleViewApplicationLifetime singleViewLifetime)
                 singleViewLifetime.MainView = new MainView();
-            
+
             base.OnFrameworkInitializationCompleted();
         }
     }