I have created a sample RadGrid web site to demonstrate how you can achieve the desired functionality. Please check out the attached application and try to implement it in accordance with your specific scenario.
Greetings,
Eyup
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 now.