Hi! If I specify sortOrder for a column as a plain constant ("ASCENDING", "DESCENDING" or "UNSORTED"), all fine: a click on a header actually cycles the sort order and the sort icon.

But if I use a variable, ui:param or even "#{'ASCENDING'}" instead of  "ASCENDING", it sorts once, but a click on header won't change the sort  order.

It's in 3.3.3.Final .

<rich:dataTable width="300px" value="#{testBean.testList}" var="entry" id="table">
  <f:facet name="header">
      <rich:columnGroup>
          <rich:column>
              <h:outputText value="id" />
          </rich:column>
          <rich:column >
              <h:outputText value="value"/>
          </rich:column>
      </rich:columnGroup>
  </f:facet>
    <rich:column filterBy="#{entry.id}" sortBy="#{entry.id}" sortOrder="#{'DESCENDING'}">
      #{entry.id}
    </rich:column>
    <rich:column filterBy="#{entry.value}" sortBy="#{entry.value}">
      #{entry.value}
    </rich:column>
</rich:dataTable>

Is it a bug or a mistake in my code? If bug, is there a goog workaround?