[AS2] Radio button undefined

[latoyale]

My radio button on comes up undefined when I am tracing it. Where am I going wrong? Thanks

SSCq2a.setGroupName("radioGroup");
SSCq2b.setGroupName("radioGroup");

submit_button.onRelease = function() {

var userAnswer:String = _root.radioGroup.getValue();
};

trace(userAnswer);

getURL("form.asp", "_self", "POST");
stop();