Drag And Drop in SIlverlight's ChildWindow is limited operation. However, you can workaround this with the RadDragAndDropManager's events when implementing custom drag and drop operation.Please check out this help article and let us know if it is a good starting point for you or if you need more info or assistance.
All the best,
the Telerik team
Thank you for being the most amazing .NET community! Your unfailing support is what helps us charge forward!
We'd appreciate your vote for Telerik in this year's DevProConnections Awards. We are competing in mind-blowing 20 categories and every vote counts! VOTE for Telerik NOW >>