``indexPathForRow:inSection`` doesn't quite make sense due to there being multiple items horizontally (in one "row"). We use ``indexPathForItem:inSection:`` to conform similarly to how UICollectionView does. The PSViewController in the BroBoard example seems to still use the row property, when really it should be using the item property instead. See: http://developer.apple.com/library/ios/#documentation/uikit/reference/NSIndexPath_UIKitAdditions/Reference/Reference.html