code: public void setSelectOnTab(final boolean selectOnTab) {
          if (selectOnTab)
              attrMixin.setAttribute(SELECT_ON_TAB, Boolean.toString(true));
          else
              attrMixin.removeAttribute(SELECT_ON_TAB);
      }
docs: When set to <code>true</code>, treats the tab character like the
  <code>enter</code> or <code>Space</code> characters within the
  select picker drop-down.<br>
  <br>
  Defaults to <code>false</code>.
  
  @param selectOnTab