I can't set the value of a radio button that is dynamic created using data interator

I have two tables (Question & Answers) that I am using data iterator to navigate. My questions and answers are populating and displaying as expected, however, when I try to retrieve the value of of the selected radio button I get no value.

The code:

As the value I am looking for displayed correctly on screen, I can’t determine why it is not binding to the input control.

I found the answer in an existing tutorial.