Hello Nadeem and Joe,
Currently, there isn't a control that works similar to RadCoverFlow and that allows UIElements such as treeview or grid. As I mentioned before, we are developing our new RadCoverFlow that will be able to do this. Moreover, we are developing a set of new panels that will enable you present and layout your elements in very advance scenarios, but unfortunately these are still in R&D phase and I cannot reveal any information.
Joe, we plan to release a beta version of our new RadCoverFlow control along with several other controls that are being developed right know. I cannot give you an exact time frame, but it should about a month from now. As you understand, we can decide to postpone a beta version of these controls, and include it for our Q3 release which is scheduled for November 2009.
Thank you for contacting us and we look forward to receiving feedback for our new controls once they are released. Keep up the good feedback you share.
All the best,
the Telerik team