code: @UiChild(tagname="rightButton", limit=1)
      public void setRightButton(JQMButton button) {
          if (right != null) remove(right);
          button.setPosOnBand(PosOnBand.RIGHT);
          right = button;
          add(right);
      }
docs: Sets the right button to be the given button. Any existing button is removed.
  
  @param button - the button to set on the right slot