title: ProgressView wont update in tableview
body: <p>I am trying to update a custom tableview cell's progressview but the progress view wont update.</p>
  
  <p>I can set the labels on the tableview cell but accessing things like progress bars or activity indicators doesnt work.</p>
  
  <p>I do the following on the custom cell</p>
  
  <pre><code>cell.progressView.hidden = NO;
  cell.progressView.progress = 0.5;
  [cell.progressView setNeedsDisplay];
  </code></pre>
  
  <p>This doesnt work even though in the debugger I see the object is of the correct cell type and the progressView is allocated.</p>
  
  <p>I have tried setNeedsDisplay on the cell itself as well, but no luck. What am I missing?</p>