public override CGSize GetReferenceSizeForFooter(UICollectionView collectionView, UICollectionViewLayout layout, nint section)
        {
            if (GroupableItemsViewController == null)
            {
                return(CGSize.Empty);
            }

            return(GroupableItemsViewController.GetReferenceSizeForFooter(collectionView, layout, section));
        }
 public override void ScrollAnimationEnded(UIScrollView scrollView)
 {
     GroupableItemsViewController?.HandleScrollAnimationEnded();
     CarouselViewController?.ScrollAnimationEnded(scrollView);
 }