Execute wiring on event

[gpioli]

Hi everybody!

I doing some experiments with seam 2.2.2 Final.
I have used seam generate-entities starting from two very simple tables, the entities are Parent:

@Entity
@Table(name = "Parent", catalog = "seam_fk_test_001")
public class Parent implements java.io.Serializable {

     private Integer idParent;private String parentDesc;
     private Set<Child> childs = new HashSet<Child>(0);
     [...]
}

and Child:

@Entity
@Table(name = "Child", catalog = "seam_fk_test_001")
public class Child implements java.io.Serializable {

     private Integer idChild;
     private Parent parent;
     private String childDesc;
        [...]
}

I would like to add to childEdit.xhtml the capability of choosing the Parent using a selectOneMenu, here is my code:

     <s:decorate id="idParentField" template="/layout/edit.xhtml">
          <ui:define name="label">Parent</ui:define>
          <h:selectOneMenu id="idParent"
               required="true"
               disabled="#{childHome.managed}"
               value="#{childHome.instance.parent}">
               <!-- valueChangeListener="#{childHome.prewire}" -->
               <s:selectItems value="#{parentList.resultList}" var="_p" label="#{_p.parentDesc}" noSelectionLabel="Select parent..."/>
               <s:convertEntity/>
               <!-- <a:support action="#{childHome.prewire}" event="onblur" reRender="child" bypassUpdates="true" /> -->
          </h:selectOneMenu>
     </s:decorate>

I would not to modify the behaviour of the generated button and let it disable until all required field and dependency are not satisfied:

            <h:commandButton id="save"
                          value="Save"
                         action="#{childHome.persist}"
                       disabled="#{!childHome.wired}"
                       rendered="#{!childHome.managed}"/>
                       <!-- disabled="#{!childHome.wired}" -->

So my question is how can i invoke the wire method from a jsf page? I have tried various approach but without any luck and I haven't been able to find any info on this subject.

Thank you.

GP