RichTable Header is not Displaying when i export it into exc

[aboocs01]

i am working in exporting the data table values in excel sheet ... ya i can able t those data table values... but i cant get the data table header along with that values in excel... how can i get it please...




exporting excel sheet button

<h:commandButton id="exportId" type="submit" value="Export to excel"
action="#{org.jboss.seam.excel.exporter.excelExporter.export('lodgingChargeform:lodgingChargelistId','jxl')}" />


data table:


<rich:dataTable id="lodgingChargelistId" var="lodgingCharge" value="#{financialReports.getLodgingCharges()}" rows="#{financialReportsSearchData.recordsPerPage}" width="100%" columnClasses="align-center,align-left,align-right,align-right,align-right,align-right">
<f:facet name="header">
<rich:columnGroup>
<rich:column>
<h:outputText value="Reference No." />
</rich:column>
<rich:column>
<h:outputText value="Room No." />
</rich:column>
<rich:column>
<h:outputText value="Surcharges" />
</rich:column>
<rich:column>
<h:outputText value="Tax" />
</rich:column>
<rich:column>
<h:outputText value="Discount" />
</rich:column>
<rich:column>
<h:outputText value="Lodging" />
</rich:column>

</rich:columnGroup>
</f:facet>

<rich:column>
<h:outputText value="#{lodgingCharge.referenceNumber}" />
</rich:column>
<rich:column>
<h:outputText value="#{lodgingCharge.roomNo}" />
</rich:column>
<rich:column>
<h:outputText value="#{lodgingCharge.surcharges}" />
</rich:column>
<rich:column>
<h:outputText value="#{lodgingCharge.taxes}" />
</rich:column>
<rich:column>
<h:outputText value="#{lodgingCharge.discount}"/>
</rich:column>
<rich:column>
<h:outputText value="#{lodgingCharge.charges}"/>
</rich:column>
<f:facet name="footer">
<rich:columnGroup>
<rich:column style="background-color:#DAD4D4;border-right:1px solid #C0C0C0;border-left:1px solid #C0C0C0;">
<h:outputText value=""></h:outputText>
</rich:column>
<rich:column style="background-color:#DAD4D4;border-left:1px solid #DAD4D4;text-align:right;">
<h:outputText value=" Totals"></h:outputText>
</rich:column>
<rich:column style="background-color:#DAD4D4;text-align:right">
<h:outputText value="#{systemUtils.formatDecimal(financialReports.totalSurCharges, selectedInstance.currencyFormat.businessValue)}" style="color:black;font-weight:bold;height:25px;" ></h:outputText>
</rich:column>
<rich:column style="background-color:#DAD4D4;text-align:right">
<h:outputText value="#{systemUtils.formatDecimal(financialReports.totalTax, selectedInstance.currencyFormat.businessValue)}" style="color:black;font-weight:bold;height:25px;"></h:outputText>
</rich:column>
<rich:column style="background-color:#DAD4D4;text-align:right">
<h:outputText value="#{systemUtils.formatDecimal(financialReports.totalDiscount, selectedInstance.currencyFormat.businessValue)}" style="color:black;font-weight:bold;height:25px;"></h:outputText>
</rich:column>
<rich:column style="background-color:#DAD4D4;text-align:right">
<h:outputText value="#{systemUtils.formatDecimal(financialReports.totalCharges, selectedInstance.currencyFormat.businessValue)}" style="color:black;font-weight:bold;height:25px;"></h:outputText>
</rich:column>
</rich:columnGroup>
</f:facet>
</rich:dataTable>