InputDate problem

[Patrick Dalla Bernardina]

I have the following datatable:
every input other than inputDate updates the correspondent  bean property .
Why inputDate doesn't updates the bean property associated with the 
value attribute?



<h:dataTable id="dependentes" headerClass="portlet-section-header"
   rowClasses="portlet-section-body,portlet-section-alternate"
   value="#{FuncionariosBackBean.dependentes}"
   var="dependente" binding="#{FuncionariosBackBean.dtDependentes}"
   rendered="#{FuncionariosBackBean.temDependentes}">
   <h:column>
       <f:facet name="header">
           <h:outputText value="Dependentes"/>
       </f:facet>
       <h:panelGrid columns="2" headerClass="portlet-section-header" 
rowClasses="portlet-section-body">
           <f:facet name="header">
               <h:outputText 
value="Nome:#{dependente.nome}"></h:outputText>
           </f:facet>
           <h:outputText value="CPF:"/>
           <h:inputText value="#{dependente.cpf}"/>

           <h:outputText value="Data Expedição:"/>
           <ext:inputDate renderAsPopup="true" 
value="#{dependente.dataExpedicao}">
           </ext:inputDate>
       </h:panelGrid>
   </h:column>
</h:dataTable>