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What you describe is actually the definition of the Checkbox field, and not of the Radiobutton. The Radiobutton is essentially a set of widgets which stand for the selection of exactly one of mutually exclusive options, wheras the Checkbox is essentially a set of widgets which stand for the selection of maximum one of mutually exclusive options.
Therefore, if you want to stick with Radiobuttons, you would have to add another one which has the return value "Off", and which would have the label "None".
Or, you convert to Checkboxes, where you would have the same name, but different return values (such as it would be with Radiobuttons).
Hope, this can help.
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I have a radio button with (say) three sub elements. I am trying to allow a user who clicks on a "on" radio button to turn it off. I am aware of the setFlag (for bitpos 15) that will supposedly enable this. I am unable to get this to work, however. I tried to then insert some JavaScript into a field using the FDF, but it appears that I am unable to reference the sub-field. I have tried using the field name (ex: C0130) and the element name (C0130.1). What am I missing?
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