@Override
  public void addButtonToLowerPane(@NotNull Action action) {
    ThreadingAssertions.assertEventDispatchThread();
    int index = myButtonPanel.getComponentCount();
    if (!SystemInfo.isMac && index > 0 && myPresentation.isShowCancelButton()) index--;
    myButtonPanel.addButtonAction(index, action);
    Object o = action.getValue(Action.ACCELERATOR_KEY);
    if (o instanceof KeyStroke) {
      myTree.registerKeyboardAction(action, (KeyStroke)o, JComponent.WHEN_FOCUSED);
    }
  }
@Override
  public void addButtonToLowerPane(@NotNull Action action)