Tests/VSXaml/MainPage.xaml

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

    <Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
        <TextBlock Text="I'm a CMake XAML App" HorizontalAlignment="Center" VerticalAlignment="Center"
                   Style="{StaticResource HeaderTextBlockStyle}"/>
    </Grid>
</Page>