private void draw_circleGoButton()
        {/*draw the right blue circle Button*/
            if (this.InvokeRequired)
            {
                this.Invoke(new MethodInvoker(this.draw_circleGoButton));
            }
            else
            {
                // Create a Button object
                circleGoButton = new ButtonEllipse();

                // radius of circle button
                int diameter = objdiameter;

                // Set Button properties
                circleGoButton.Location = new Point(Width - diameter - rightgap, Height / 2 - diameter / 2);
                circleGoButton.Height   = diameter;
                circleGoButton.Width    = diameter;

                // Set background and foreground
                circleGoButton.BackColor = Color.Blue;
                circleGoButton.Name      = "circleGoButton";

                // Add a Button Click Event handler
                circleGoButton.Click += new EventHandler(circleGoButton_Click);

                // tag for clicked or not
                goNogoButton_IsClicked = false;

                this.Controls.Add(circleGoButton);

                circleGoButton.Update();
            }
        }
        private void circleGoButton_Click(object sender, EventArgs e)
        {
            ButtonEllipse btn = sender as ButtonEllipse;

            btn.BackColor = Color.Yellow;
            circleGoButton.Update();

            goNogoButton_IsClicked = true;
        }
        private void interface_ready()
        {
            if (this.InvokeRequired)
            {
                this.Invoke(new MethodInvoker(this.interface_ready));
            }
            else
            {
                g.Clear(Color.Black);
                if (circleGoButton != null)
                {
                    Controls.Remove(circleGoButton);
                    circleGoButton.Dispose();
                    circleGoButton = null;
                }

                if (squareNogoButton != null)
                {
                    Controls.Remove(squareNogoButton);
                    squareNogoButton.Dispose();
                    squareNogoButton = null;
                }
            }
        }