title: how do disable the focus in javascript fancytree
body: <p>I have found a way to disable the activation when an item is clicked by canceling its processing with beforeactivate. I would also like to disable the focus. The thin square around the item focused. Is there a way to do it in javascript, or shall I aim for the CSS directly ?</p>
  
  <p>Many thanks,</p>
  
  <p>M</p>