void Form1_Load(object sender, EventArgs e)
        {
            //Show Form 2 lúc khởi động
            screen_form frmshowClock = new screen_form(controlPanel);

            frmshowClock.Show();
        }
        private void show_btt_Click(object sender, EventArgs e)
        {
            screen_form screen = new screen_form(controlPanel);

            screen.Show();
        }