private void menu7_3_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
 {
     FeedBack.PageTeacherStudentFeedback m_PageTeacherStudentFeedback = new FeedBack.PageTeacherStudentFeedback(3);
     FrameMiddleContent.Navigate(m_PageTeacherStudentFeedback);
 }
 private void menu7_1_PreviewMouseDown(object sender, System.Windows.Input.MouseButtonEventArgs e)
 {
     // TODO: Add event handler implementation here.
     FeedBack.PageTeacherStudentFeedback m_PageTeacherStudentFeedback = new FeedBack.PageTeacherStudentFeedback(1);
     FrameMiddleContent.Navigate(m_PageTeacherStudentFeedback);
 }