This may or may not help but what I did was to use text boxes and when the student selects a "wrong" choice the text box appears to tell them that it's wrong or "try again".The "correct" box appears when they make the correct selection.To add a little bit more, you can tie the "next" button in with the correct answer which will allow them to proceed only if the correct answer is chosen.I do all of these using actions tied to the answering mechanism.
