Stanford Assignment 3 HelloPoly: 1 Control/Multiple Actions

I should have known this from my experience in Flash!  The solution to why it only draws the first polygon is that the same buttons, Increase and Decrease, required multiple, in this case 2, actions, not just one.  Basically you need to define another method, inside the polygonview, which calls setNeedsDispaly.  And hook up the same buttons in the nib file to that method.

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