title: ExtJs 4 dynamic form fields in nested panels aren't submitted
body: <p>Let's say I have multiple nested panels (plain ones, not form.Panel) containing form fields.
  The user can copy such a panel and its fields to a different panel.</p>
  
  <p>I somehow need to add those newly created fields to a main formpanel so they get submitted, but don't know how.</p>
  
  <p>I can't do</p>
  
  <pre><code>formpanel.add(fields)
  </code></pre>
  
  <p>because then they're rendered to the formpanel's body and not the panel they were in in the first place. Setting the fields' renderTo property doesn't help either.</p>
  
  <p>So basically I need a way of adding a field to a normal panel (or any other component for that matter), but also adding it to a specific formpanel so its values are submitted on form submit.</p>
  
  <p>Has anyone done this or could at least point me in the right direction?</p>