code: public void setShowTick(final boolean showTick) {
          if (showTick)
              attrMixin.setAttribute(SHOW_TICK, Boolean.toString(true));
          else
              attrMixin.removeAttribute(SHOW_TICK);
      }
docs: Set to <code>true</code> to show check mark icon on
  standard select boxes.<br>
  <br>
  Defaults to <code>false</code>.
  
  @param showTick