Avalonia/samples/IntegrationTestApp/Pages/DesktopPage.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             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"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="IntegrationTestApp.Pages.DesktopPage">
  <StackPanel>
    <CheckBox x:FieldModifier="public" Name="TrayIconClicked">Tray Icon Clicked</CheckBox>
    <CheckBox x:FieldModifier="public" Name="TrayIconMenuClicked">Tray Icon Menu Clicked</CheckBox>
    <Button Name="ToggleTrayIconVisible"
            Content="Toggle TrayIcon Visible"
            Click="ToggleTrayIconVisible_Click"/>
  </StackPanel>
</UserControl>