title: ExtJs tree panel. How to scroll to a node
body: <p>I have a Tree Panel which I expand programmatically.</p>
  
  <p>When I expand a node, I would like to "jump to" this node, I mean to scroll to it.</p>
  
  <p>How to scroll a tree panel to a specific node ?</p>
  
  <p><strong>UPDATE</strong>:
  I use <strong>Ext 4.1</strong></p>