Hi Randall Kohltfarber,
I apologise for the confusion. Both elements "TreeNodeUI" actually affect the same type of element in the treeview - these would be all the treenodes.
This means you can set properties of either one of those and the result would be the same. We will consider changing this UI to make it easier to use.
Let me know if have any other issues.
All the best,
the Telerik team