private Point CoordinatesOfButton(Button[,] haystack,Button find)
        {
            int w = haystack.GetLength(0); // width
            int h = haystack.GetLength(1); // height

            for (int x = 0; x < w; ++x)
            {
                for (int y = 0; y < h; ++y)
                {
                    if (haystack[x, y].Equals(find))
                        return new Point(x, y);
                }
            }

            return new Point();
        }