I have a rich data table that has a table header. I want to use this header for sorting the columns. Is there a way to sort the table columns from the table header? I do not want to put "header" facet into the table columns definitions. I am defining the column headers in the table header.

<rich:dataTable id="dataTableTr" value="#{transferQueryController.requestsOfUser}" var="transferReq"
border="1" cellpadding="2" rows="10">
<f:facet name="header">
<rich:columnGroup>
<rich:column>
<h:outputText value="#{msg.requestDate}" />
</rich:column>
<rich:column>
<h:outputText value="#{msg.requestUser}" />
</rich:column>
</rich:columnGroup>
</f:facet>
<rich:columnGroup>
<rich:column width="50px" id="requestDate">
<h:outputText value="#{transferReq.requestDate}">
</h:outputText>
</rich:column>

<rich:column width="50px">
<h:outputText value="#{transferReq.userName}"></h:outputText>
</rich:column>
</rich:columnGroup>
</rich:dataTable>