richfaces jsf

                <rich:column width="25%">
                    <f:facet name="header"> 
                        <h:outputText value="S.No." /> 
                    </f:facet>
                    #{it.index+1}
                </rich:column>
                    <rich:column>
                        <f:facet name="header">
                                 <h:outputText value="Create" />
                        </f:facet>
                        <a4j:commandLink styleClass="addLink"  action="#{depotOpeningStockManageBean.createNewLotShow}"
                         execute="@this" oncomplete="#{rich:component('addPane')}.show()"  value="Create" >

                        </a4j:commandLink>
                    </rich:column>
        </rich:dataTable>

         <rich:popupPanel id="addPane" resizeable="true"  domElementAttachment="parent">     
         <h:commandLink  value="cancel"  onclick="#{rich:component('addPane')}.hide()" />
         </rich:popupPanel>
 popup window is not displayed can anyone khw what is the reason

display when i used rich:datagrid and richpanel but not in rich:datatable