problems with stateless forms and radiogroups/checkgroups

I'm trying to use radiogroup/checkgroup with stateless form, and it is not possible at the moment. I get the following exception:

submitted http post value [radio4] for RadioGroup component [0:form:whatever] is illegal because it does not contain relative path to a Radio componnet. Due to this the RadioGroup component cannot resolve the selected Radio component pointed to by the illegal value. A possible reason is that component hierarchy changed between rendering and form submission.

I think the problem lies inside Check & Radio components, which use Page.getAutoIndex() and that value is different before and after page submission for Check/Radio components.

Now, it is not possible to override getValue() on Check/Radio components, so I'm kind of stuck now...