             
             reloadButtons()
         }
-
+        
         supplementaryViews[indexPath.section]?.selected = true
     }
     

        super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
        initialize()
    }

    required public init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        initialize()

        collectionView.registerClass(PreviewSupplementaryView.self, forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: NSStringFromClass(PreviewSupplementaryView.self))
        
        return collectionView
        }()
    
    lazy var backgroundView: UIView = {
        let view = UIView()
