code: private void removeNavigationFrameView(SwingFrame frameView) {
  		navigationFrames.remove(frameView);
  		if (navigationFrames.size() == 0) {
  			System.exit(0);
  		}
  	}
docs: Removes a frameView from the list and exits if it was the last
  
  @param frameView NavigationFrameView to remove from the list