TemplatedItemsList <TView, TItem> InsertGrouped(object item, int index)
        {
            var children = item as IEnumerable;

            var groupProxy = new TemplatedItemsList <TView, TItem>(this, children, _itemsView, _itemTemplateProperty);

            if (GroupDisplayBinding != null)
            {
                groupProxy.SetBinding(NameProperty, GroupDisplayBinding.Clone());
            }
            else if (GroupHeaderTemplate == null && item != null)
            {
                groupProxy.Name = item.ToString();
            }

            if (GroupShortNameBinding != null)
            {
                groupProxy.SetBinding(ShortNameProperty, GroupShortNameBinding.Clone());
            }

            groupProxy.BindingContext = item;

            if (GroupHeaderTemplate != null)
            {
                groupProxy.HeaderContent = (TItem)GroupHeaderTemplate.CreateContent(groupProxy.ItemsSource, _itemsView);
                groupProxy.HeaderContent.BindingContext = groupProxy.ItemsSource;
                //groupProxy.HeaderContent.BindingContext = groupProxy;
                //groupProxy.HeaderContent.SetBinding (BindingContextProperty, "ItemsSource");
            }
            else
            {
                // HACK: TemplatedItemsList shouldn't assume what the default is, but it needs
                // to be able to setup bindings. Needs some internal-API tweaking there isn't
                // time for right now.
                groupProxy.HeaderContent = _itemsView.CreateDefault(ListProxy.ProxiedEnumerable);
                groupProxy.HeaderContent.BindingContext = groupProxy;
                groupProxy.HeaderContent.SetBinding(TextCell.TextProperty, "Name");
            }

            SetIndex(groupProxy.HeaderContent, index);
            SetIsGroupHeader(groupProxy.HeaderContent, true);

            _itemsView.SetupContent(groupProxy.HeaderContent, index);

            _templatedObjects.Insert(index, groupProxy.HeaderContent);
            _groupedItems.Insert(index, item, groupProxy);

            groupProxy.CollectionChanged += OnInnerCollectionChanged;

            return(groupProxy);
        }