private int Callback()
        {
            MathPane mp = new MathPane(Callback);

            flowLayoutPanel1.Controls.Add(mp);
            mp.Init();
            return(1);
        }
        private void Form1_Load(object sender, EventArgs e)
        {
            MathPane mp = new MathPane(Callback);

            flowLayoutPanel1.Controls.Add(mp);
        }