Thank you for your report.
I managed to reproduce the issue. We missed this feature when we re-factored and redesigned the RadTreeView control in Q1 2011. The issue will be addressed in the upcoming service pack due in the end of August. In the meantime, I cannot provide you with work around due to internal implementation of RadTreeView. I hope that this is not show stopper for you.
I updated your Telerik points.
the Telerik team
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