In order to achieve the desired behavior, you should change the example project.
In particular you should replace
in private void OnDropInfo(object sender, DragDropEventArgs e)
with this snippet:
if ((destination as RadTreeView) != null)
(destination as RadTreeView).Items.Add(treeViewItem);
else if ((destination as RadTreeViewItem) != null)
(destination as RadTreeViewItem).Items.Add(treeViewItem);
Modifying the example in this way will allow you to drop the dragged item anywhere in the treeview.
Please let us know if this solution works for you.
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