want a treeview that only postbacks on lowest node

[Jason Shohet]

The treeview (the one that came with .NET), causes a postback on ea. node
click.
I want to set it so that it only causes a postback when the treeview item
has no more nodes below it.
That way as the user is drilling down, they don't have to get unnecessary
screen refreshes (postbacks).
Any ideas how to do this? (ie via javascript, etc)

TY
Jason Shohet