Hi -
There isn't a way in the ISF provided to change the radio button values that a user selects. There is only a method setSelection() to change which option is selected. In order to dynamically change the radio button option values, you can use a data retrieval rule or you can use non-ISF javascript to manipulate the form object to change the values. If you are planning on manipulating the selectable values, I'd suggest using a single selection HTML control as the options are a easier to manipulate and you also have less to worry about getting all of the other required attributes set up correctly on a dynamically generated radio button object.
