Problems with a radio button group

OK. So I am having a problem with radio buttons. Here’s what I am doing:

  1. Add a number of radio buttons to stage
  2. Add them to a group (I reuse the same group over and over)
  3. User chooses a button and clicks a “Submit” button
  4. Check that a button was selected
if (! radGroup.selection)
  1. If button not selected --> handle error
  2. If button selected, good, do stuff
  3. Remove all of the buttons
  4. Add the next set of buttons for the next question

The “if (! radGroup.selection)” works fine on the first question. The problem is with all of the next questions. I assume that since I am using the same group, the “radGroup.selection” will always be true after the user makes a selection the first time.

So, is it feasible to nullify the group each time the user answers a question? If so, does anyone know how to do this?