Added sample TrayIcon which crashes when a tray icon menu item is act…

…ivated.

samples/TrayIcon/AboutWindow.axaml

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+<Window xmlns="https://github.com/avaloniaui"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        x:Class="TrayIcon.AboutWindow"
+        Title="Avalonia Tray Icon Sample"
+        Width="800" Height="400" WindowState="Normal" WindowStartupLocation="CenterScreen">
+  <Grid>
+    <Grid.RowDefinitions>
+      <RowDefinition Height="*" />
+      <RowDefinition Height="Auto" />
+    </Grid.RowDefinitions>
+
+    <Label FontSize="24" HorizontalContentAlignment="Center" VerticalContentAlignment="Center">
+      Avalonia Tray Icon Sample
+    </Label>
+
+    <Button Name="cmdClose" Click="cmdClose_Click" Grid.Row="1" Margin="30" HorizontalAlignment="Center">_Close</Button>
+  </Grid>
+</Window>

samples/TrayIcon/AboutWindow.axaml.cs

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+using Avalonia.Controls;
+using Avalonia.Interactivity;
+
+namespace TrayIcon
+{
+    public partial class AboutWindow : Window
+    {
+        public AboutWindow()
+        {
+            InitializeComponent();
+        }
+
+        void cmdClose_Click(object? sender, RoutedEventArgs e)
+        {
+            this.Close();
+        }
+    }
+}

samples/TrayIcon/App.axaml

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+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:local="using:TrayIcon"
+             x:Class="TrayIcon.App"
+             x:CompileBindings="true"
+             x:DataType="local:App"
+             RequestedThemeVariant="Default">
+    <Application.Styles>
+        <FluentTheme />
+    </Application.Styles>
+
+    <TrayIcon.Icons>
+        <TrayIcons>
+            <TrayIcon Icon="Icon.ico" ToolTipText="TrayIcon Sample">
+                <TrayIcon.Menu>
+                    <NativeMenu>
+                        <NativeMenuItem Header="_About" Command="{Binding AboutCommand}" />
+                        <NativeMenuItemSeparator />
+                        <NativeMenuItem Header="E_xit" Command="{Binding ExitCommand}" />
+                    </NativeMenu>
+                </TrayIcon.Menu>
+            </TrayIcon>
+        </TrayIcons>
+    </TrayIcon.Icons>
+</Application>

samples/TrayIcon/App.axaml.cs

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+using System.Windows.Input;
+
+using Avalonia;
+using Avalonia.Controls.ApplicationLifetimes;
+using Avalonia.Markup.Xaml;
+
+using ReactiveUI;
+
+namespace TrayIcon
+{
+    public partial class App : Application
+    {
+        public override void Initialize()
+        {
+            AvaloniaXamlLoader.Load(this);
+        }
+
+        public App()
+        {
+            AboutCommand = ReactiveCommand.Create(ShowAboutWindow);
+            ExitCommand = ReactiveCommand.Create(ExitApplication);
+
+            DataContext = this;
+        }
+
+        public override void OnFrameworkInitializationCompleted()
+        {
+            if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
+            {
+                _lifetime = desktop;
+
+                desktop.ShutdownMode = Avalonia.Controls.ShutdownMode.OnExplicitShutdown;
+            }
+
+            base.OnFrameworkInitializationCompleted();
+        }
+
+        IClassicDesktopStyleApplicationLifetime? _lifetime;
+
+        public ICommand AboutCommand { get; }
+        public ICommand ExitCommand { get; }
+
+        void ShowAboutWindow()
+        {
+            var window = new AboutWindow();
+
+            window.Show();
+        }
+
+        void ExitApplication()
+        {
+            _lifetime?.Shutdown();
+        }
+    }
+}
+

samples/TrayIcon/App.manifest

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+<?xml version="1.0" encoding="utf-8"?>
+<assembly manifestVersion="1.0" xmlns="urn:schemas-microsoft-com:asm.v1">
+  <!-- This manifest is used on Windows only.
+       Don't remove it as it might cause problems with window transparency and embedded controls.
+       For more details visit https://learn.microsoft.com/en-us/windows/win32/sbscs/application-manifests -->
+  <assemblyIdentity version="1.0.0.0" name="DeltaQ.RTB.UserInterface.Desktop"/>
+
+  <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
+    <application>
+      <!-- A list of the Windows versions that this application has been tested on
+           and is designed to work with. Uncomment the appropriate elements
+           and Windows will automatically select the most compatible environment. -->
+
+      <!-- Windows 10 -->
+      <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}" />
+    </application>
+  </compatibility>
+</assembly>

samples/TrayIcon/AssemblyInfo.cs

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+using System.Runtime.CompilerServices;

samples/TrayIcon/Program.cs

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+using System;
+
+using Avalonia;
+
+namespace TrayIcon
+{
+	class Program
+	{
+		[STAThread]
+		public static void Main(string[] args)
+		{
+			var app = BuildAvaloniaApp();
+
+			app.StartWithClassicDesktopLifetime(args);
+		}
+
+		public static AppBuilder BuildAvaloniaApp()
+		{
+			return AppBuilder.Configure<App>()
+				.UsePlatformDetect()
+				.WithInterFont()
+				.LogToTrace();
+		}
+	}
+}

samples/TrayIcon/TrayIcon.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <IncludeAvaloniaGenerators>true</IncludeAvaloniaGenerators>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\src\Avalonia.Themes.Fluent\Avalonia.Themes.Fluent.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Fonts.Inter\Avalonia.Fonts.Inter.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.ReactiveUI\Avalonia.ReactiveUI.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Desktop\Avalonia.Desktop.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Diagnostics\Avalonia.Diagnostics.csproj" />
+    <ProjectReference Include="..\..\src\Avalonia.Remote.Protocol\Avalonia.Remote.Protocol.csproj" />
+  </ItemGroup>
+
+  <Import Project="..\..\build\SampleApp.props" />
+  <Import Project="..\..\build\ReferenceCoreLibraries.props" /> 
+  <Import Project="..\..\build\BuildTargets.targets" /> 
+  <Import Project="..\..\build\SourceGenerators.props" />
+
+  <ItemGroup>
+    <AvaloniaResource Include="Icon.ico" />
+  </ItemGroup>
+</Project>