I am using a custom style for the scrollviewer/scrollbar components, and inside one of these I have put a treeview with drag/drop enabled. This has always worked fine. But now I have tried upgrading to the Beta2_2009_3_1023 version of RadControls. Now when I try to drag a tree item to another, the whole thing crashes. This seems to have to do with my custom style, as it works just fine when I just use the default scrollviewer. Please take a look and see if it can be fixed. For now I will use the default scrollviewer style for the trees wheere I need drag/drop.