Hello Steve,
You can use the
IsDropAllowed property of RadTreeViewItem. In a data-bound scenario you have to use container bindings to set the IsDropAllowed property. More information on hierarchical data and container bindings you can find
here. I've also attached a sample project that demonstrates one possible solution to your scenario. Have a look at it and let me know if you have further questions or comments.
All the best,
Kiril Stanoev
the Telerik team
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