private void switchToFaceColorChooser() {
   switchTo(faceColorChooser);
 }
 private void switchToPointColorChooser() {
   switchTo(pointColorChooser);
 }
 public void actionPerformed(ActionEvent e) {
   switchTo(appearancePanel);
 }
 private void switchToLineColorChooser() {
   switchTo(lineColorChooser);
 }