Presumably you are "deleting" the node by calling its Remove method or the Remove method of its parent collection. In order to get the AfterDelete event to fire, you must remove selected nodes via the PerformAction( UltraTreeAction.DeleteNodes) method, after enabling node deletion by setting Override.AllowDelete.

How are you deleting the nodes? In code, or via the user interface?

If the BeforeDelete event firing?

Is the tree bound or unbound?

What version are you using?