Avalonia/samples/ControlGallery.WinUI/MainWindow.xaml

<?xml version="1.0" encoding="utf-8"?>
<Window
    x:Class="ControlGallery.WinUI.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:avalonia="using:Avalonia.WinUI"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    Title="ControlGallery.WinUI">

    <Grid>
        <avalonia:AvaloniaSwapChainPanel x:Name="AvaloniaPanel" />
    </Grid>
</Window>