I am not sure that I understand your scenario correctly. The RadTreeView does not have build in logic to delete any of the items once you press the Delete key. Have you implemented such logic in your project? If so, before deleting any of the items on Delete key press you could check if the treeview is currently focused and then delete the item.
If that is not your case please give us more information about your scenario and if possible steps to reproduce you scenario.
I hope this information helps.
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