I'm trying to create a "main menu" of sorts with buttons linking to other frames.  I was able to make a separate frame with this example ( http://www.sojamo.de/libraries/controlP5/examples/extra/ControlP5frame/ControlP5frame.pde) but I want to be able to change visibility of it.  I see the line f.setVisible(true); but I'm not sure how to change that with a button that's on the original frame.  Mostly, I'm not really sure how the controlEvents work between the main window and the PApplet control frame.  

I feel like the answer is really obvious but I can't seem to find it...