private void ComboBoxSelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (MaxNumberOfAnswers <= 1 &&
Characteristic.SelectedCharacteristicQuantificationAllowedTerms.Count > 0 &&
Characteristic.SelectedCharacteristicQuantificationAllowedTerms[0] != _comboBox.SelectedItem)
{
Characteristic.ClearSelectedAllowedTerms();
}
if (_comboBox.SelectedItem != null)
{
((CharacteristicQuantificationAllowedTerm)_comboBox.SelectedItem).Selected = true;
}
}