Timer timer;
        int autoCloseInterval = 5;
        int count = 0;

        private void radButton1_Click(object sender, EventArgs e)
        {
            timer = new Timer();
            timer.Interval = 1000;
            timer.Tick += timer_Tick;
            timer.Start();
            RadMessageBox.Show("Warning", "Are you sure you want to quit?", MessageBoxButtons.YesNo, "Please don't quite yet!");
        }

        private void timer_Tick(object sender, EventArgs e)
        {
            count++;
            RadMessageBox.Instance.Controls["radButton1"].Text = "Yes (" + (autoCloseInterval - count) + ")";
            if (count > autoCloseInterval)
            {
                timer.Stop();
                RadMessageBox.Instance.Close();
            }
        }