title: Shiny expanding submenu items manually
body: <p>I'm trying to manually expand a submenu in a sidebar in shiny dashboard. The updateTabItems function allows me to go to the tab, but it does not expand the menu with it.</p>
  
  <p>I am looking for a reproducible answer to the question here:<a href="https://stackoverflow.com/questions/32465177/how-to-manually-expand-a-submenu-in-a-shiny-dashboard-side-bar">how to manually expand a submenu in a shiny dashboard side bar</a> 
  which includes a nice working example and answers which are however not implemented.</p>