Hi SivaPrasad Bevara,
FocusScope is not supported in Silverlight. So this is not supported out-of-the box. But it can easily be done. Just add handler to context menu Closed event and call Focus on the context menu UIElement property.
Let us know if you need more information.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items