Hi,
I have the same code but it works, the rendred id is panelgrid id,
<h:selectOneRadio
value="#{myBean.value}">
<f:selectItems value="#{items}" />
<a4j:support event="onclick"
actionListener="#{myBean.do}"
reRender="list"></a4j:support>
</h:selectOneRadio>
a+.