Hi Beimel,Richard,
Query1: DragOverEvent’s DragTreeViewItemEventArgs Data is always null
Query 2: DragDropping child items are get duplicatied.
We have logged a defect report internally for the above query reported under the forum, As per our Forum regulations , we will not be able to share the fix for this issue. However, if you are interested in receiving the fix for this issue, then, we would request you to use our Direct-Trac Support system to resolve all your technical queries.
For more details, please login into http://www.syncfusion.com/Account/ and we will be happy to help you.
Please let us know if you have any queries.
Regards,
Karthikeyan