I am afraid this issue is not fixed yet, we have been focusing on important tasks like creating the RadTileList control
. You can use the feedback portal to comment, and track the problem, voting for it can raise its priority.
Another thing you can try is using an entire page in the RadWindow, instead of the ContentTemplate. This demo
can show you how to return data from it to the main page.
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed