/// <summary>
        /// Create smaller grid for pathfinding - for non-async calls
        /// </summary>
        /// <param name="designer">From this viewmodel is grid created</param>
        /// <param name="step">Grid row/col step</param>
        /// <returns>Created grid</returns>
        public static Grid CreateMinifiedGridForPathFindingSync(DatabaseModelDesignerViewModel designer, int step)
        {
            var rects = GetTableRectangles(designer.TableViewModels, step).Select(s =>
            {
                var t = s.Y / step;
                var l = s.X / step;
                var r = s.Right / step;
                var b = s.Bottom / step;
                return(new Rectangle(l, t, r - l, b - t));
            });

            return(PathFinderHelper.CreateGrid((int)(designer.CanvasWidth / step), (int)designer.CanvasHeight / step, rects));
        }
        /// <summary>
        /// Create smaller grid for pathfinding
        /// </summary>
        /// <param name="designer">From this viewmodel is grid created</param>
        /// <param name="step">Grid row/col step</param>
        /// <returns>Task for async execution => Created grid</returns>
        public static async Task <Grid> CreateMinifiedGridForPathFinding(DatabaseModelDesignerViewModel designer, int step)
        {
            var rects = GetTableRectangles(designer.TableViewModels, step).Select(s =>
            {
                var t = s.Y / step;
                var l = s.X / step;
                var r = s.Right / step;
                var b = s.Bottom / step;
                return(new Rectangle(l, t, r - l, b - t));
            });
            var res = await Task.Factory.StartNew(() => PathFinderHelper.CreateGrid((int)(designer.CanvasWidth / step), (int)designer.CanvasHeight / step, rects));

            return(res);
        }