title: Indexpath of the button from UICollectionView
body: <p>I tried to:</p>
  
  <pre><code>- (IBAction)delete:(UIButton*)sender{
      NSIndexPath *indexPath = [self.collectionView indexPathForCell:(TourGridCell *)[[[sender superview]superview]superview]];
  }
  </code></pre>
  
  <p>But NSLog shows that cell exist, but indexpath is nil.</p>