/// <summary>
/// resets model and navigates back to root question
/// </summary>
public void Reset()
{
Question root = QuestionLink.First();
QuestionLink.Clear();
QuestionLink.Add(root);
updateByCurentQuestion();
}
/// <summary>
///
/// </summary>
/// <param name="answer"></param>
public void SelectAnswer(Answer answer)
{
Question subq = QuestionLink.Last().getQuestionByAnswer(answer.Id);
if (!QuestionLink.Contains(subq))
{
QuestionLink.Add(subq);
updateByCurentQuestion();
}
}