title: Drag and Drop in NSCollectionView example
body: <p>I need drag and drop in NSCollectionView. </p>
  
  <p>So I looked at Apples code-sample:
  <a href="https://developer.apple.com/library/mac/#samplecode/IconCollection/Introduction/Intro.html" rel="nofollow">https://developer.apple.com/library/mac/#samplecode/IconCollection/Introduction/Intro.html</a></p>
  
  <p>There is a method for dragging. But it's not working. </p>
  
  <p>I added the following method  without result:</p>
  
  <pre><code>-(BOOL) collectionView:(NSCollectionView *)collectionView canDragItemsAtIndexes:(NSIndexSet *)indexes withEvent:(NSEvent *)event {
      return YES;
  }
  </code></pre>
  
  <p>The Delegate is set. </p>
  
  <p>Does anybody know a solution?</p>