Thank you for the question.
does not support such customization abilities. If more people request such an option, we will consider implementing it in a future release.
Should you have any further questions, do not hesitate to ask.
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.