private void buttonAddAnswer_Click(object sender, EventArgs e)
        {
            FormAddAnswer form = new FormAddAnswer(dec);

            form.ShowDialog();
            listBoxAnswersI.DataSource = dec.GetListAnswers();
        }
        private void buttonAddAnswerIII_Click(object sender, EventArgs e)
        {
            FormAddAnswer form = new FormAddAnswer(decLabelIII);

            form.ShowDialog();
            labelSum3.Text = SumPoint.sumPoint3.ToString();
            listBoxAnswersIII.DataSource = decLabelIII.GetListAnswers();
        }