title: How do you delete itemrenderers in a spark Listform for mobile?
body: <p>I've got a spark ListForm with a custom mxml itemRenderer,
  all the itemRenderer has is:</p>
  
  <pre><code>&lt;s:Label text="{data.name}" /&gt;
  </code></pre>
  
  <p>When I run the profiler, the listform is not re-using the itemRenderers,
  the instances keep going up and up,
  I'm using an arrayCollection as the dataprovider.
  I even call the dataprovider (arrayCollection) .removeAll() and the
  display goes blank, yet the number of instances of the itemRenderer does
  not go down. I then run the garbage collector in the profiler, and the
  item renderers still stay in memory. How can I remove the itemRenderers from memory?</p>