private void TutorialTree_SelectedItemChanged(object sender, RoutedPropertyChangedEventArgs <object> e)
        {
            TreeViewItem treeItem    = (TreeViewItem)tutorialTree.SelectedItem;
            UserControl  userControl = new UserControl();

            if (!treeItem.HasItems)
            {
                switch (treeItem.Header.ToString())
                {
                case "Departments Dashboard":
                    userControl = new DepartmentHelpUserControl();
                    break;

                case "Teachers Dashboard":
                    userControl = new TeacherHelpUserControl();
                    break;

                case "Terms Dashboard":
                    userControl = new TermHelpUserControl();
                    break;

                case "Courses Dashboard":
                    userControl = new CourseHelpUserControl();
                    break;

                case "Assignments Dashboard":
                    userControl = new AssignmentHelpUserControl();
                    break;

                case "Exams Dashboard":
                    userControl = new ExamDashboardHelpUserControl();
                    break;

                case "My Exams Dashboard":
                    userControl = new MyExamDashboardHelpUserControl();
                    break;

                case "My Profile":
                    userControl = new MyProfileHelpUserControl();
                    break;

                case "Insert Students":
                    userControl = new InsertStudentsHelpUserControl();
                    break;

                case "Create Exam":
                    userControl = new CreateExamHelpUserControl();
                    break;

                default: break;
                }
                if (userControl != null)
                {
                    helpSP.Children.Clear();
                    helpSP.Children.Add(userControl);
                }
            }
        }
        private void HelpBtn_Click(object sender, RoutedEventArgs e)
        {
            TabItem     item        = (TabItem)tabs.SelectedItem;
            UserControl userControl = new UserControl();

            switch (item.Header.ToString())
            {
            case "Departments":
                userControl = new DepartmentHelpUserControl();
                break;

            case "Teachers":
                userControl = new TeacherHelpUserControl();
                break;

            case "Terms":
                userControl = new TermHelpUserControl();
                break;

            case "Courses":
                userControl = new CourseHelpUserControl();
                break;

            case "Assignments":
                userControl = new AssignmentHelpUserControl();
                break;

            case "Exams":
                userControl = new ExamDashboardHelpUserControl();
                break;

            default: break;
            }
            flyout.IsOpen = true;
            if (userControl != null)
            {
                helpSP.Children.Clear();
                helpSP.Children.Add(userControl);
            }
        }