Avalonia/samples/IntegrationTestApp/Pages/PopupsPage.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="IntegrationTestApp.Pages.PopupsPage">
  
  <StackPanel Orientation="Vertical" Spacing="10">
    
    <TextBlock Text="'Light Dismiss' Popup" />
    <Button Content="Show Popup" Click="ButtonLightDismiss_OnClick" />

    <TextBlock Text="Popup that stays open" />
    <Button Content="Show Popup" Click="ButtonPopupStaysOpen_OnClick" />

    <TextBlock Text="TopMost popup that stays open" />
    <Button Content="Show Popup" Click="ButtonTopMostPopupStaysOpen" />

  </StackPanel>
  
</UserControl>