We could not reproduce this issue using our latest release and we want to investigate this case further. Could you please send us a sample application and describe the exact steps to reproduce the issue in it?
Please note that you have to open a new support ticket in order to attach your files.
Thank you for your cooperation. I am looking forward to your project.
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.