private void setupDownKey(JComponent component) {
    @NlsSafe
    String actionName = "FCB_DOWN";
    Action action = new AbstractAction(actionName) {

      private static final long serialVersionUID = -4133513199725709434L;

      @Override
      public void actionPerformed(ActionEvent e) {
        // if popup is not visible, just make it visible.
        // if popup has not the focus, pass it the focus
        // else: move down!
        if (popup.isVisible()) {
          if (popup.isPopupFocused()) {
            popup.selectDown(false);
          }
          else {
            popup.setPopupFocused(true);
          }
        }
        else {
          showChoices();
        }
      }
    };
    component.getActionMap().put(actionName, action);
    component.getInputMap(JComponent.WHEN_FOCUSED)
      .put(KeyStroke.getKeyStroke(KeyEvent.VK_DOWN, 0), actionName);
  }
private void setupDownKey(JComponent component)