We are planning to introduce such feature in the grid for the next official release of the controls in June.
You can follow our blogs to stay informed about the latest improvements and features that will be rolled in the next release.
All the best,
the Telerik team
If you want to get updates on new releases, tips and tricks and sneak peeks at our product labs directly from the developers working on the RadControls for ASP.NET AJAX, subscribe to their blog feed