jsf - how to update primeface datatable using poll with updated toggled columns -

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i've been working on jsf project(using primefaces 5.2). i've datatable gets updated using poll in every 10 seconds.i have column toggler. working fine problem when poll updates datatable again adds columns table.is there way restrict datatable show selected toggled columns after poll update.

here xhtml code

<h:form rendered="#{bean.value!=null}"  >          <p:datatable id="tab" var="var" value="#{bean.value}" >                       <f:facet name="header">                         header datatable                         <p:commandbutton style="float:right" id="toggler" type="button" value="columns"  icon="ui-icon-calculator" />                         <p:columntoggler datasource="tab" trigger="toggler" />                        </f:facet>         <p:column>                 <f:facet name="header"><h:outputtext value="start"/>                 </f:facet>                 <h:outputtext value="#{var.starttime}">                     <f:convertdatetime pattern="dd.mm.yyyy" />                 </h:outputtext>             </p:column>              <p:column>                 <f:facet name="header"><h:outputtext value="end"/>                 </f:facet>                 <h:outputtext value="#{var.endtime}" >                     <f:convertdatetime pattern="dd.mm.yyyy"  />                 </h:outputtext>             </p:column>              <p:column>                 <f:facet name="header"><h:outputtext value="name"/>                 </f:facet>                 <h:outputtext value="#{var.name}" >                  </h:outputtext>             </p:column>              </p:datatable>              <p:poll interval="10"  update="tab" />   </h:form>


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