More strangeness. I downloaded the app again and this time it the app worked??? I also tried it out with 4.0 and 4.5 and that also worked. But know for the really strange part. When I open the xaml file I get squiggle lines for GridViewRow and any other GridViewRow related property. How do I still get a clean compile and the app works???
GridviewRow, DragDropManager does not exist in namespace