private void btnBack_Click(object sender, RoutedEventArgs e)
        {
            TraineeFunctions m = new TraineeFunctions();

            this.Close();
            m.Show();
        }
        private void btnMore_Click(object sender, RoutedEventArgs e)
        {
            TraineeFunctions t = new TraineeFunctions();

            this.Close();
            t.Show();
        }