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">

    <Button x:Name="DismissButton"
            Content="Dismiss Button" />

    <TextBlock Text="'Light Dismiss' Popup" />

    <Button x:Name="ShowLightDismissPopup"
            Content="Show Popup" Click="ButtonLightDismiss_OnClick" />
    <Popup x:Name="LightDismissPopup"
           PlacementTarget="ShowLightDismissPopup"
           Placement="Bottom"
           IsLightDismissEnabled="True">
      <Panel Background="Gray"
             Margin="10"
             MinWidth="100"
             MinHeight="30">
        <TextBox Text="Popup Content"
                 Name="LightDismissPopupContent" />
      </Panel>
    </Popup>

    <TextBlock Text="Popup that stays open" />
    <Button x:Name="ShowStaysOpenPopup"
            Content="Show Popup" Click="ButtonPopupStaysOpen_OnClick" />
    <Popup x:Name="StaysOpenPopup"
           PlacementTarget="ShowStaysOpenPopup"
           Placement="Bottom"
           IsLightDismissEnabled="False">
      <StackPanel Background="Gray"
                  MinWidth="100"
                  MinHeight="30"
                  Spacing="20"
                  Orientation="Vertical">
        <TextBox Name="StaysOpenTextBox"
                 Width="100"
                 Text="Some text" />
        <Button Name="StaysOpenPopupCloseButton"
                Click="StaysOpenPopupCloseButton_OnClick"
                Content="Click to Close" />
      </StackPanel>
    </Popup>

    <TextBlock Text="TopMost popup that stays open" />
    <Button x:Name="ShowTopMostPopup"
            Content="Show Popup" Click="ButtonTopMostPopupStaysOpen" />
    <Popup x:Name="TopMostPopup"
           Placement="Top"
           PlacementTarget="ShowTopMostPopup"
           IsLightDismissEnabled="False"
           Topmost="True">
      <Panel MinWidth="100"
             MinHeight="30"
             Background="Gray">
        <Button Name="TopMostPopupCloseButton"
                Click="TopMostPopupCloseButton_OnClick"
                Content="Click to Close" />
      </Panel>
    </Popup>

    <Button x:Name="OpenNewWindowButton"
            Content="Open Regular New Window"
            Click="OpenRegularNewWindow_Click" />
  </StackPanel>

</UserControl>