internal PhotoNode FindPhotoNode(Photograph photo)
        {
            AlbumNode albumNode = SelectedNode as AlbumNode;

            if (albumNode != null)
            {
                albumNode.Expand();
                foreach (PhotoNode node in albumNode.Nodes)
                {
                    if (node.Photograph == photo)
                    {
                        return(node);
                    }
                }
            }
            return(null);
        }