To answer my own question in case anybody else has the same problem:
It is not possible out of the box. You have to pass null together with
the other options to RadioChoice
and then set your own ChoiceRenderer which returns the localized value
in the same way as
AbstractSingleSelectChoice.g
Hello,
is it possible to get RadioChoice behave more like DropDownChoice
concerning a null value?
Consider a RadioChoice defining a search parameter, e.g. two values
'male' and 'female' and a third one
meaning "doesn't matter".
With a DropDownChoice I could easily use setNullValid(true) and
