MainPage.xaml

<Page
    x:Class="VideoBug.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:local="using:VideoBug"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    xmlns:canvas="using:Microsoft.Graphics.Canvas.UI.Xaml"
    mc:Ignorable="d"
    Background="Black">

    <StackPanel Orientation="Vertical">
        
        <Button
            Content="Export Screenshot"
            Click="ExportScreenshot"/>

        <Button
            Content="Copy Screenshot"
            Click="CopyScreenshot"/>

        <Button
            Content="Export Video"
            Click="ExportVideo"/>

        <StackPanel
            x:Name="Colours"
            Orientation="Vertical"
            Background="White">

            <Rectangle
                Fill="Red"
                Width="200"
                Height="50"/>
            <Rectangle
                Fill="Green"
                Width="200"
                Height="50"/>
            <Rectangle
                Fill="Blue"
                Width="200"
                Height="50"/>

            <canvas:CanvasControl
                x:Name="Canvas"
                Width="200"
                Height="300"
                Draw="RedrawCanvas"/>           

        </StackPanel>

    </StackPanel>
</Page>