Hello Mark Hanson,
Generally, you can find the answer to your question in your support ticket: RadTreeNode Look.
However, I am posting the answer here as well, in case somebody else is interested in the topic:
"I am afraid that RadTreeView does not provide this functionality out of the box.
You will have to loop through RadTreeView after the binding and set your colors as needed. This can be done using the properties of RadTreeNode - BackColor, ForeColor, etc. Let me know if you have trouble with this.
We are currently considering implementing WPF-like data templates but have not yet reached a decision.
We will provide an ItemDataBound event for RadTreeView in a future release."
the Telerik team