Radio buttons come in groups. In LiveCycle Designer, when you select a single button, you're selecting the entire group as far as the button values are concerned. Look on the Object window. You'll find a listing there of the radio button group values, and you can edit them.
To get a value from a radio button just use the fields name.
In JavaScript use this code for a Radio button group named MyRadio
MyRadio.rawValue;
You can find out more by watching this video:
https://admin.adobe.acrobat.com/_a200985228/p87746471/Thom Parker
WindJack Solutions
www.windjack.compdfscripting.comThe Acrobat JavaScript Reference, Use it Early and Often
http://www.adobe.com/devnet/acrobat/