Thank you for writing.
This functionality is currently not supported by our RadGridView. We will consider it in our future development plans if more customers ask for it.
If you have other questions, feel free to ask.
the Telerik team
Q2’11 SP1 of RadControls for WinForms is available for download (see what's new); also available is the Q3'11 Roadmap for Telerik Windows Forms controls.