Radio Button alt text not read by Screen Readers

I've built a Likert-style survey in SL3.  In it are several statements, each followed by  seven radio buttons, "Strongly Disagree" to "Strongly Agree". In "Tab Order", I've assigned the appropriate alt text to each button so that screen reader users will know which button goes with which reaction.  However, in testing, I've found that neither JAWS, NVDA nor VoiceOver will read the alt text.  (They only say "Radio Button: Radio" or "Radio Button 2" for each of the seven buttons.)  Is there a known workaround for this?


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