I am looking in a WinRT/Universal Application Xaml file, and I see references to StaticResource and a new (in Windows 8.1) ThemeResource markup extension. Here is an example:
<Grid Background="{ThemeResource ApplicationPageBackgroundThemeBrush}">
</Grid>
I understand that the resource 'ApplicationPageBackgroundThemeBrush' is defined as a default resource brush. However, what I am looking for is where the ThemeResource markup extension as defined in a .winmd or .dll file so that I can see all of its properties and methods. It doesn't appear that I can access this type in a code-behind (or any other code file).
As an example, the Binding markup extension I can see is defined in Windows.UI.Xaml.Data.Binding in the resource file C:\Program Files (x86)\Windows Kits\8.1\References\CommonConfiguration\Neutral\Windows.winmd.
However, I do not see any definition of StaticResource or ThemeResource. Where are these objects located and defined?