System brushes for WinRT/XAML appsWhat are they? If you've poked around the code that's generated by the various "Metro style" C#/XAML or VB/XAML templates in Visual Studio, you've seen mysterious resource references like: <Setter Property="Background" Value="{StaticResource ApplicationPageBackgroundThemeBrush}"/> ApplicationPageBackgroundThemeBrush isn't declared anywhere in your project; it's actually defined implicitly by the W
