public partial class frmTrafficLight : Form
    {
        TrafficLight trafficLightLeft = new TrafficLight(75, Color.Red);
        TrafficLight trafficLightRight = new TrafficLight(55, Color.Green);

        public frmTrafficLight()
        {
            InitializeComponent();
        }

        private void pbLeft_Paint(object sender, PaintEventArgs e)
        {
            trafficLightLeft.Draw(e.Graphics);
        }

        private void btnChangeColorLeft_Click(object sender, EventArgs e)
        {
            trafficLightLeft.ChangeColor();
            Refresh();
        }

        private void btnBiggerLeft_Click(object sender, EventArgs e)
        {
            // On click the drawing becomes bigger with 5
            if (trafficLightLeft.Size < 75)
            {
                trafficLightLeft.Size += 5;
                Refresh();
            }
        }

        private void btnSmallerLeft_Click(object sender, EventArgs e)
        {
            // On click the drawing becomes smaller with 5
            if (trafficLightLeft.Size > 5)
            {
                trafficLightLeft.Size -= 5;
                Refresh();
            }
        }

        private void pbRight_Paint(object sender, PaintEventArgs e)
        {
            trafficLightRight.Draw(e.Graphics);
        }

        private void btnChangeColorRight_Click(object sender, EventArgs e)
        {
            trafficLightRight.ChangeColor();
            Refresh();
        }

        private void btnBiggerRight_Click(object sender, EventArgs e)
        {
            if (trafficLightRight.Size < 75)
            {
                trafficLightRight.Size += 5;
                Refresh();
            }
        }

        private void btnSmallerRight_Click(object sender, EventArgs e)
        {
            if (trafficLightRight.Size > 5)
            {
                trafficLightRight.Size -= 5;
                Refresh();
            }
        }
    }
}