title: jquery-ui-multiselect-widget change selectedText on optgrouptoggle
body: <p>How i could change selectedText by optgrouptoggle?</p>
  
  <p><a href="https://github.com/ehynds/jquery-ui-multiselect-widget/" rel="nofollow">https://github.com/ehynds/jquery-ui-multiselect-widget/</a></p>