Overriding CommandBarButton.Click event without making an 'Add-in'

I'm new to this whole modifying word and stuff but basically I have already added my commandbarbutton to the "File" commandbar. Now I want to show a form on a different thread when they click it.

I've been trying to find example code (not vba) that will do this. I see that you can implement the commandbarbutton interface in a different class, but there are like a gabillion methods to implement.

how can i achieve this without having to do an add-in/vba module?

If there is no way that is dumb.

thanks,

Justin