return null; }
if (key == LOWER_RIGHT_CORNER) return lowerRight; else if (key == UPPER_RIGHT_CORNER) return upperRight; else if (key == LOWER_LEFT_CORNER) return lowerLeft; else if (key == UPPER_LEFT_CORNER) return upperLeft; return null; }
	public Component getCorner(String key) {		return null; // TODO	} // getCorner()