Thank you for writing back.
I used your code in a project in a try to reproduce the issue, however I was unable to do so. In the project I apply the theme in the form Load event as you did not specify where in your code you are applying it. I have attached a video demonstrating the behavior on my side. I would kindly ask you to provide information on how you are applying the theme and when in order for me to find the case of the issue.
I am looking forward to your reply.
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.