Please, note that there are a RadTreeList and RadTreeView controls. The RadTreeView control is available in your version of RadControls.
If you mean RadTreeList however, a control capable of displaying self-referencing data would be RadGrid but its capabilities in this direction are limited. You can see an online demo here
RadControls upgrade instructions are available at the following address:
Updating RadControls for ASP.NET to another version or license
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