Looks question

I defined a project nature that extends the java project
nature. As part of this, I defined a Look for java source
nodes. As part of that Look, I add actions to the pop up
menu for java source nodes. That works fine. But I also
want to register my own OpenCookie so that if the user
selects "Open", my open method is called instead. How do
I do that? I'm not having any luck getting this to work.

Thanks,
   -Joe-