static <A extends PApplet> A pMainAsComponent(Class<A> c) {
  final A applet = pMain(c);
  Window w = getWindow(applet);
  applet.frame = null;
  for (WindowListener l : w.getWindowListeners())
    w.removeWindowListener(l);
  getParent(applet).remove(applet);
  disposeWindow(w);
  ret applet;
}