How to make dynamically generated tiles in Windows Mobile 7?

This project was inspired by the way how menu in Portal 2 game works. Portal 2 is a first-person puzzle-platform video game developed by Valve Corporation. Really interesting and very well executed. Going back to the subject when I saw Portal 2 menu in action I decided to do something similar in WM7. The whole idea is quite simple:

1. define your area of interest e.g. a whole screen or a part
2. make a screenshot
3. populate WrapPanel with rectangles which contain appropriate parts of the previously created screenshot.
4. hide your area of interest (yourUIElement)
5. start animations
6. perform a transition if needed 

Points 1 and 2

   1:              WriteableBitmap bmp = new WriteableBitmap((int)LayoutRoot.ActualWidth, (int)LayoutRoot.ActualHeight);

   2:              bmp.Render(yourUIElement, null);

   3:              bmp.Invalidate();

   4:              image.Source = bmp;