Can one of the admins verify this patch?

@mgbot test

Test PASSed.
Refer to this link for build results: http://build.monogame.net/job/PullRequestTester/571/

Where is your DrawingSurfaceBackgroundGrid? It should be set using this line:
UIElement drawingSurface = page.Content as DrawingSurfaceBackgroundGrid;

@Nezz - Are you saying this shouldn't be merged?

Yes, it shouldn't be merged unless @RTLShadow can explain where he put his DrawingSurfaceBackgroundGrid and why :)

@Nezz I was unaware that was needed- I can try it. Here is the issue it fixed (and the where i got the code from): #2081

@Nezz - Are you happy with this now?

I still don't understand why the DrawingSurfaceBackgroundGrid is a child element and not the root.

From http://blogs.windows.com/windows_phone/b/wpdev/archive/2012/11/05/windows-phone-8-developer-platform-highlights.aspx:

DrawingSurfaceBackgroundGrid is a very special element that must always be the root element of a page and allows developers to render directly to the background from Direct3D using C++.

Ok... gonna close this. @RTLShadow can resubmit if he can answer your questions about it.