code: public View getMenuButton(MenuButton button) {
          switch (button) {
              case MID:
                  return mMidContainer;
              case LEFT:
                  return mLeftContainer;
              case RIGHT:
                  return mRightContainer;
          }
          return null;
      }
docs: Returns the menu button container. The first child of the container is
  a TextView, the second - an ImageButton
  
  @param button one of {@link MenuButton#LEFT}, {@link MenuButton#MID}, {@link MenuButton#RIGHT}