title: xcode CollectionViewController scrollToItemAtIndexPath not working
body: <p>I have created a <code>CollectionView</code> Control and filled it with images. Now I want to scroll to item at a particular index on start. I have tried out <code>scrollToItemAtIndexPath</code> as follows:</p>
  
  <pre><code>[self.myFullScreenCollectionView scrollToItemAtIndexPath:indexPath 
  atScrollPosition:UICollectionViewScrollPositionCenteredHorizontally animated:YES];
  </code></pre>
  
  <p>However, I am getting following exception. Could anyone guide me on where am I going wrong.</p>
  
  <pre><code>2013-02-20 02:32:45.219 ControlViewCollection1[1727:c07] *** Assertion failure in 
  -[UICollectionViewData layoutAttributesForItemAtIndexPath:], /SourceCache/UIKit_Sim/UIKit-2380.17
  /UICollectionViewData.m:485 2013-02-20 02:32:45.221 ControlViewCollection1[1727:c07] must return a 
  UICollectionViewLayoutAttributes instance from -layoutAttributesForItemAtIndexPath: for path 
  &lt;NSIndexPath 0x800abe0&gt; 2 indexes [0, 4]
  </code></pre>