I have a selectManyCheckbox embeeded in an rich:dataGrid:

<rich:dataGrid value="#{groupsList}" var="groups" columns="4" elements="4">
<rich:panel>
<f:facet name="header">
<!--select implicitly the group by selecting the roles within the group -->
<h:outputText value="#{groups.description}"/>
<!-- convertEntity-Tag not compatible to outputText -->
<s:convertEntity/>
</f:facet>
<h:selectManyCheckbox value="#{myRolesInGroup(groups, roles)}">
<s:selectItems value="#{rolesList}" var="roles" label="#{roles.description}"/>
<s:convertEntity/>
</h:selectManyCheckbox>
</rich:panel>
<f:facet name="footer">
<rich:datascroller></rich:datascroller>
</f:facet>
</rich:dataGrid>

The groupsList and the rolesList are obtained via the Factory-Methods:

@Factory("rolesList")
public List <Roles> getRolesList() {
return entityManager.createQuery("from Roles r").getResultList();
 }

@Factory("groupsList")
...

The 'myRolesInGroup(group, roles)' is a Map:

private Map<Group, Roles> myRolesInMailroom

//with getter/setter
..

But this works not as I cannot declare a convertEntity-Tag to my h:outputText-Tag.

How can I associate the choosen roles to the group in a simply way?