Hello sandeep,
Thank you for writing.
Can you please share which version of our controls are you using? It will be even better if you can open a new support ticket and attach your project. This will allow me to investigate your case and provide you with further support.
I am looking forward to your reply.
Regards,
Stefan
the Telerik team
Check out the Q1 2011
Roadmap for Telerik Controls for Windows Forms.