/// <summary>
        /// call the methods paint each 100ms
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void tmr_Tick(object sender, EventArgs e)
        {
            /*if (!gameInProgress)
                this.CreateCendre();*/

            if (!gameInProgress && this.gameover == null)
                this.gameover = new GameOver(this);

            Invalidate();
        }