<Window
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    x:Class="HelloApp.Window1"
    Title ="HelloApp"
    Background="White"
    >
    <StackPanel>
        <TextBlock x:Uid="loc1">Hello World</TextBlock>
        <TextBlock x:Uid="loc2">Goodbye World</TextBlock>
    </StackPanel>
</Window>