MainWindow.xaml

<!-- Copyright (c) Microsoft Corporation. All rights reserved. -->
<!-- Licensed under the MIT License. See LICENSE in the project root for license information. -->

<Window
    x:Class="WinUI3_SwapChainPanel_Layered.MainWindow"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:WinUI3_SwapChainPanel_Layered"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d">

    <SwapChainPanel x:Name="swapChainPanel1" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" >
        <Border x:Name="mainBorder" BorderThickness="3" CornerRadius="45" BorderBrush="Red" Background="Transparent" Margin="5, 5, 5, 5">
            <StackPanel x:Name="sp1" Orientation="Vertical" HorizontalAlignment="Stretch" VerticalAlignment="Stretch">
                <TextBlock x:Name="tb1" Text="Right-click to exit" Margin="5,5,5,5" HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="Yellow"/>
                <Grid Margin="5, 70, 5, 5">
                    <Grid.ColumnDefinitions>
                        <ColumnDefinition Width="*"></ColumnDefinition>
                        <ColumnDefinition Width="*"></ColumnDefinition>
                        <ColumnDefinition Width="*"></ColumnDefinition>                      
                    </Grid.ColumnDefinitions>
                    <Image x:Name="img1" Source="Assets/Butterfly.png" Grid.Column="0" Width="250" Height="250" Stretch="Uniform" Margin="15, 5, 5, 5">
                    </Image>
                    <TextBlock x:Name="tb2" Grid.Column="0" Text="Not Click Through" Margin="5,5,5,5" 
                               HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White" Visibility="Collapsed"/>
                    <Button x:Name="myButton" Click="myButton_Click" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="10, 10, 10, 10" Background="Blue">
                        Set Bitmap
                    </Button>                   
                    <Image x:Name="img2" Source="Assets/Butterfly.png" Grid.Column="2" Width="250" Height="250" Stretch="Uniform" Margin="5, 5, 15, 5" IsHitTestVisible="false">
                    </Image>
                    <TextBlock x:Name="tb3" Grid.Column="2" Text="Click Through" Margin="5,5,5,5"
                               HorizontalAlignment="Center" VerticalAlignment="Center" Foreground="White"  Visibility="Collapsed" IsHitTestVisible="false"/>
                </Grid>
                <ToggleSwitch x:Name="tsClickThrough" Header="Click Through" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="65, 5, 0, 5"
                          OffContent="No" OnContent="Yes" Toggled="tsClickThrough_Toggled" >
                    <ToolTipService.ToolTip>
                        <ToolTip Content="Set Click Through On/Off&#x0a;when clicked on window background" Placement="Bottom" Background="LightYellow" Foreground="Black"/>
                    </ToolTipService.ToolTip>
                </ToggleSwitch>                       
                <!--<Rectangle Width="100" Height="100" Fill="Blue" Stroke="Orange" Margin="5, 40, 5, 5" IsHitTestVisible="False"
                            StrokeThickness="3" />-->              
            </StackPanel>
        </Border>
    </SwapChainPanel>
</Window>