private void EnableTextFields()
{
bool b = questionView.SelectedItems.Count > 0;
textBoxQuestion.Enabled = b;
textBoxAnswer1.Enabled = b;
textBoxAnswer2.Enabled = b;
textBoxAnswer3.Enabled = b;
textBoxAnswer4.Enabled = b;
if(!b) comboBoxCorrectAnswer.Items.Clear();
comboBoxCorrectAnswer.Enabled = b;
}