if (popupMouseListener != null) arrowButton.addMouseListener(popupMouseListener); if (popupMouseMotionListener != null) arrowButton.addMouseMotionListener(popupMouseMotionListener); }
  public void configureArrowButton()  {    arrowButton.setEnabled(comboBox.isEnabled());    arrowButton.setFont(comboBox.getFont());    arrowButton.setFocusable(false);  }