>
>I can successfully assign the property in a treeview,
>the problem I'm having is once having assigned it, to
>set it back to nothing (.null).
Tom,
I'm always in trouble with treeview. I can set it to "nothing" with a dummy workaround :

with ThisForm.Oletreeview
	oNode = .nodes.add(,1,"myDummy") && Add dummy node
	.drophighlight = oNode           && set drophighlight to dummy
	.nodes.remove(oNode.key)         && remove dummy
endwith	

BTW could you assign it with hittest ?
Cetin