Prevent Dragging Nodes To Other Parents in TreeGrid

[bwilkins30]

I want to have the ability to drag nodes to sub-parents, but I don't want to have the ability to drag nodes to other parents. For instance,


Parent A
- Node 1
- Sub-Parent A
Parent B

In the example above, I want to be able to drag Node 1 to Sub-Parent A and back to Parent A, but not to Parent B.

How can I do this? I have tried using the onDrop event but I do not know how to tell which node was moved to which parent. If it is an invalid parent, I want to be able to cancel that event.

DataSources are not used.

[bwilkins30]

I can get the event source from the onDrop event, but how do I know which node was moved and to where?