Hi Stephen,
There is no default support for handling special keys of the control cell in a Grid. But you can derive the GridGenericControlCellRenderer and override the OnKeyDown method to acheive this.
The attached sample shows how you can do this in a OnKeyDown. It implements the GridGenericControlCellRenderer and prepare what ever keys you want to handle.
Sample :
http://www.syncfusion.com/Support/user/uploads/GGCcontrols_d9b54eb2.zipPlease let me know if you need any further assistance.
Best Regards,
Haneef