public static string GetTileRoot(this MapTiles part)
        {
            var mediaField = part.Get<MediaField>(Constants.TilesMediaFileFieldName);

            if (mediaField == null || !mediaField.Paths.Any())
            {
                return null;
            }

            return Path.Combine(Path.GetDirectoryName(mediaField.Paths[0]), part.ContentItem.ContentItemId);
        }