Thank you for contacting us and sorry for the delayed answer.
Straight to your questions:
1. In xbap application the Window is realized in the AdornerLayer
and that is why it cannot be shown outside the application.
2. To set this colour you can use the ModalBackground
property of the RadWindow.
3. You can use RadTransitionControl
which is a ContentControl. Attached I am sending you a sample project illustrating its usage. If that doesn't work for you I can send you the StoryBoards used in the demos' page.
If you have any other questions regarding our controls please feel free to contact us again.
All the best,
the Telerik team
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