private ThumbnailItem win_DataItemLoadedEvent(string file)
        {
            PuzzleItem pi = PuzzleData.LoadPuzzleItem(file);

            if (pi.Type != PuzzleSetting.Instance.Type)
            {
                return(null);
            }
            pi.ImageFile = file;
            ControlMgr.Instance.DataMgr.Add(pi);
            return(pi);
        }