Display Custom column contents of Document in Content Server (Oracle Webcenter)

Hi,

  I have a custom field called "Comments" that belong to a document in UCM. I would like to display Comments value along with the file name in my content presenter. How would I do that.? I have tried the following option but that doesn't display anything.

<dt:contentListTemplateDef var="nodes">

      <af:table var="node" value="#{nodes}" id="t1" rowBandingInterval="1" columnSelection="multiple" summary="table data" styleClass="AFStretchWidth" columnStretching="last" rows="25">

<af:column id="c12" sortProperty="Comments" sortable="true">

            <f:facet name="header">

               <af:outputText value="Comments" id="ot12"/>

            </f:facet>

            <af:outputText value="{node.Comments}" id="il12"/>

         </af:column>

</af:table>