public Form1()
        {
            InitializeComponent();
            b = new BigFunction();

            pv1 = new PlotView();

            pv1.Location = new Point(100, 50);
            pv1.Size     = new Size(200, 200);
            this.Controls.Add(pv1);
            pv1.Model = new PlotModel {
                Title = "Calculus"
            };

            //s1 = new FunctionSeries();

            //s1.MouseDown += (S, e) =>
            //{
            //        if (!bounderChecked)
            //        {
            //            lowerbound = s1.InverseTransform(e.Position).X;
            //            bounderChecked = true;
            //        }
            //        else
            //        {
            //            upperbound = s1.InverseTransform(e.Position).X;
            //            bounderChecked = false;
            //        }
            //};
        }
        public btnAddPoint()
        {
            InitializeComponent();
            b = new BigFunction();
            m = new Matrix();

            pv1 = new PlotView();
            DrawGraph();


            for (int i = 1; i <= 8; i++)
            {
                cbNrOfTerms.Items.Add(i);
            }
        }