[news.eclipse.modeling.gmf] How to override a paste command

[shxun@xxxxxxxxxxx (ps )]

Hi there,
I want to add extra behaviour(when copy a special node, if that node is 
associated with a diagram, after the paste, a different diagram should be 
created for the newly created node) to the default paste command in GMF, 
could someone tell me where to do that? 
I know the default paste command is created in 
ContainerEditPolicy.getPasteCommand, should I override this class to 
extend my extra behaviour? But it doesn't seem to be an elegant solution.

Could someone give me some instructions on how to achieve this?

Thanks in advance,

Paul