Disable questions when choice is made

I just starting using Lectora 07 yesterday and many of my questions have been answered just by researching the topics in this forum! Great job.Now to my question: I have a multiple choice quiz with only one correct answer. I have a submit button that displays the feedback on the same page...How do i get the answers/radio buttons to gray out or become disabled when the user clicks the submit button (and still show which selection they made)? I don't want them to be able to choose another answer after they have already submitted.Thanks.

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