public StretchingTreeViewItem()
        {
            if (this.stretchingTreeView == null)
            {
                this.stretchingTreeView = FindVisualParent <StretchingTreeView>(this);
            }

            this.Loaded += new RoutedEventHandler(this.StretchingTreeViewItem_Loaded);
        }
        internal StretchingTreeViewItem(StretchingTreeView stretchingTreeView)
        {
            this.stretchingTreeView = stretchingTreeView;

            this.Loaded += new RoutedEventHandler(this.StretchingTreeViewItem_Loaded);
        }