Hello Prashant,
I am just checking if you got this worked out or you still require any assistance or clarification on the matter.
Thank you for your post. I have been looking into it and I can say that there is built in context menu for copy, paste, and cut, when you enter in edit mode. If you want a context menu for the whole records I can suggest you see this forum thread:
http://ko.infragistics.com/community/forums/t/58004.aspx
where a similar question is already discussed. Please let me know if this helps you or you need further assistance on this matter.
Looking forward for your reply.