Hello Mark Leeds,
of a Node will prevent other Nodes to be dropped onto it. Dropping between Nodes is not controlled in such a way.
However, you can hook to the OnClientNodeDropping
event of the TreeView and depending on the drop position, the destination Node and its AllowDrop property you can cancel the event. In this way, you can achieve the desired functionality.
Please see these help articles for more information:
the Telerik team
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