Hi! I'm testing your WPF controls and I'm trying to make a tree hiearchy with drag and drop. The thing is I want to disable dragging all over the place. First feature I'd need is to check for leaf to leaf collision. If I'm collinding with another leaf when dragging, i want to switch their places. The other feature i'm interested in is leaf to connection coliision. I want to do it so that if i drag a leaf and collide with a connection, if i drop it it connects to that connection, severs the connection to the old leaf and reconnects it on it's tail. What would be the best way to detect such collision in your wpf controls? Any ideas? (or maybe is there something like this already implemented? I read the docs but I might have missed something.)