Hello Bits,
If you check the markup generated by the RadTreeView, you can see that it is not created with a link, but a <span>. It's look and feel is set by the CSS and javascript set by its default or custom skin. If you'd like to change how the RadTreeNode looks, you can set the CssClass and add your own styling. If you don't like it's behavior, try intercepting some of its client-side events and changing it. You can check out some of those events
here.
I hope I was helpful. If something is still not clear or you continue to have trouble, let me know and I'll try to help you further.
Sincerely,
Kevin Babcock