title: How to add item to Extjs panel at exact position
body: <p>I am adding an item to Extjs panel.</p>
  
  <pre><code>this.add(new_el);
  this.doLayout();
  </code></pre>
  
  <p>It works fine. but in some cases I have to add {new_el} at exact position, not last.</p>
  
  <p>For example penultimate one.</p>
  
  <p>Can't find easy method in Extjs 3.2.1</p>