private void AddQuestion_Click(object sender, RoutedEventArgs e)
        {
            QuestionType type;
            long         id = 0;

            if (radioButtonText.IsChecked.Value)
            {
                type = QuestionType.Text;
                id   = _contentManager.AddQuestion(_selectedQuiz, textBoxQuestion.Text, textBoxAnswer.Text, type, null);
            }
            else if (radioButtonPuzzle.IsChecked.Value)
            {
                type = QuestionType.Puzzle;
                id   = _contentManager.AddQuestion(_selectedQuiz, textBoxQuestion.Text, textBoxAnswer.Text, type, null);
            }
            else
            {
                type = QuestionType.Choice;
                id   = _contentManager.AddQuestion(_selectedQuiz, textBoxQuestion.Text, textBoxAnswer.Text, type, _wrongAnswers);
            }
            if (id > 0)
            {
                questions.Add(_contentManager.GetComponent(id) as Question);
                _saved         = false;
                Save.IsEnabled = true;
            }
        }