title: Font Awesome icons for Webix tree nodes
body: <p><a href="http://docs.webix.com/desktop__icon_types.html" rel="nofollow">Webix integrates with Font Awesome</a>. But how can Font Awesome icons be used instead of the default folder/file icons in trees to style individual nodes?</p>
  
  <p>Here's what I've tried:</p>
  
  <p><a href="http://webix.com/snippet/52251623" rel="nofollow">http://webix.com/snippet/52251623</a></p>
  
  <ul>
  <li><code>template</code> only works at the tree level</li>
  <li><code>$css</code> keeps the existing folder/file icon</li>
  <li>there is <a href="http://docs.webix.com/api__refs__ui.tree.html" rel="nofollow">no <code>icon</code> property documented for trees</a>, yet setting one does something... it changes the folder icon into a file one, when the node has children.</li>
  </ul>