set right click on a drawing

If you have seen scrapblog.com , in this website when we
create a new scrap we put some object

like square, rectangle etc then scrapblog is giving
facilities of cut , paste , undo on the particular square,
rectangle

in this way user can cut, paste the object as well as undo
%26amp; redo the work .. I am giving same functionalities in my
application

so how do it possible . in setclipboard method u can take
only string not any object .... is there any solution

please help me