in program , my code :
<a4j:form id="aform11" name="aform11">

<h:panelGrid columns="6" >
<h:outputLabel value="#{msgs['grda_xm']}" />
<h:inputText value="#{grdaBean.grda.xm}" />
<h:outputLabel value="#{msgs['grda_xb']}" />
<h:outputLabel value="#{msgs['grda_csrq']}" />
<rich:calendar id="c1" name="c1" popup="true" value="#{grdaBean.grda.dcsrq}"/>

</h:panelGrid>

</a4j:form>
</rich:modalPanel>

the modalPanel popup is right, but the rich:calendar is wrong ,don't popup .what can i do ??