title: Three20 TTTableViewController cell height
body: <p>I'm trying to change the height of the cells in my TTTableViewController from the three20 library.
  I'm using TTTableRightImageItem and I want the height to be determined by the height of the image and not the fixed height. </p>
  
  <p>Do I have to subclass TableCell? Is there a property I can just set?</p>