/// <summary>
        /// Generate and save a hexagon grid map.
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void btnSaveGrid_Click(object sender, EventArgs e)
        {
            sfdImage.ShowDialog();

            if (sfdImage.FileName != String.Empty)
            {
                MapDraw draw  = new MapDraw();
                Image   image = draw.DrawGrid();
                image.Save(sfdImage.FileName);
            }
        }