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Sorry for the bump, I am desperate for some help...
I wonder if you can somehow close the open node before performing the logic of the drop.
Have you tried calling any of the invalidation methods, like invalidateDisplayList()?
Greg, I am currently closing the entire tree when they select an item (to be dragged) from a list to the tree. I had hoped this would help, but it doesn't.
ntsii, I have tried calling the invalidateDisplayList but with no success. I am not entirely certain of what this method does, so it may work.
Steps to produce error:
1. DnD a client onto the Distribution tree
2. Open all client folders on the tree
3. DnD all reports onto first client folder, then second