I've opened a bug report 425250 and supplied a project. Seems to be related to MultiSelect mode of the Tree.
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Stefan
Telerik team
answered on 19 May 2011, 11:59 AM
Hello erwin,
I am going to copy the answer from the other thread, so the community can benefit from it:
I logged the issue in our issue tracking system. I updated also your Telerik points accordingly. The fix will be available with our next official release - Q2 2011.
Best wishes,
Stefan
the Telerik team
Q1’11 SP1 of RadControls for WinForms is available for download; also available is the Q2'11 Roadmap for Telerik Windows Forms controls.