Avalonia/samples/ControlCatalog/Pages/DialogsPage.xaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             x:Class="ControlCatalog.Pages.DialogsPage">
  <StackPanel Orientation="Vertical" Spacing="4" Margin="4">
      <CheckBox Name="UseFilters">Use filters</CheckBox>
      <Button Name="OpenFile">Open File</Button>
      <Button Name="SaveFile">Save File</Button>
      <Button Name="SelectFolder">Select Folder</Button>
      <Button Name="DecoratedWindow">Decorated window</Button>
      <Button Name="DecoratedWindowDialog">Decorated window (dialog)</Button>
      <Button Name="Dialog">Dialog</Button>
  </StackPanel>
</UserControl>