VSpackage: How to add command in Watch window

Hi all,

I am developing a VSpackage. I need to add a new command into menu which appears in Watch window when we click on a variable (in debugging).

When we enter into break mode we see that variable has the following menu: Copy, Edit Value,...,Hexademical Display and so on. 

I would like to add my custom command here. 

In what direction do i need to look? Is it related to EnvDTE components or something else?

It seems to me that this issue is poorly documented on MSDN.

Thanks in advance,