Thank you for writing.
If you are asking how to get the Node on which you are dropping the grid row, you can do this:
|private void radTreeView1_DragDrop(object sender, DragEventArgs e)
| RadTreeNode n = this.radTreeView1.GetNodeAt(e.X, e.Y);
| Object tag = n.Tag;
A bit off-topic: if your company has purchased our controls already, please ask the purchase holder to add you as a License Developer to the purchase. This will give you direct access to our support ticketing system and services. More on License Developers you can find here: www.telerik.com/account/faqs.aspx
the Telerik team