Opening a form from a method and making that method wait until the form is closed?

I am trying to figure out a way to call a method from a COM object (which I have done) and have that method pop up a form.  I need to 'pause' the method until the user is done with the form and clicks a button.  The method can then continue on and return data that may have been modified from the form.

Does anyone have any ideas on how this is possible?  Thanks in advance,

Mario R.