private void Bai_01_Click(object sender, RoutedEventArgs e)
        {
            ExcercisePageDetail excercisePageDetail = new ExcercisePageDetail();

            excercisePageDetail.Show();
            this.Close();
        }
 private void Bai_01_Click(object sender, RoutedEventArgs e)
 {
     ExcercisePageDetail excercisePageDetail = new ExcercisePageDetail();
     excercisePageDetail.Show();
     this.Close();
 }