title: How to draw delphi group boxes to have transparent backgrounds
body: <p>I'm trying to get something very subtle to work, it looks pretty awful right now. I'm trying to paint the background of a TGroupBox which I have overloaded the paint function of so that the corners are show through to their parent object.  I've got a bunch of nested group boxes that look very decent without XPThemes. </p>
  
  <p>Is there a way to paint part of a background transparent at runtime.  I'm programming the form generator, not using Delphi design view.</p>