private JComboBox getCbx() {
    if (myCbx == null) {
      myCbx = new JComboBox(myPairs);
      myCbx.setBorder(BorderFactory.createEmptyBorder());
      myCbx.addPopupMenuListener(new MyPopupMenuListener());
    }
    return myCbx;
  }
private JComboBox getCbx()