if (index == -1) return null;
if (index == -1) new Point (0, 0);
public Point getSize() {	checkWidget ();	int index = parent.indexOf (this);	if (index == -1) return null;	int hwnd = parent.handle;	RECT rect = new RECT ();	OS.SendMessage (hwnd, OS.RB_GETRECT, index, rect);	int width = rect.right - rect.left;	int height = rect.bottom - rect.top;	return new Point (width, height);}