fixed column headers in myfaces datatable

[jyothish]

i am  new to  myfaces .. Some body plz help me with a solution . how to fix the column headers inside myfaces datatble which is draggable using a panelgrid   my code goes like this   <h:panelGroup id="gridPanel1" style="width:100%; height:250px; overflow:auto;" >     <t:dataTable styleClass="standardTable"             headerClass="standardTable_Header"             footerClass="standardTable_Footer"             rowClasses="standardTable_Row1,standardTable_Row2"             var="for"             value="#{list.forecast}"             sortColumn="#{list.sort}"             sortAscending="#{list.ascending}"             preserveDataModel="true"             preserveSort="true" width="100%" rowOnMouseOver="this.style.backgroundColor='#D5D3C7'" rowOnMouseOut="this.style.backgroundColor='#FFFFE0'"    rowOnClick="this.style.backgroundColor='#D5D3C7'" rowOnDblClick="this.style.backgroundColor='#D5D3C7'"    rows="50" id="test"    >      <h:column>             <f:facet name="header">                 <t:commandSortHeader columnName="forecastId" arrow="true">                     <h:outputText value="#{bundle['forecast_Id']}" />                 </t:commandSortHeader>             </f:facet>             <h:outputText value="#{for.forecastId}" />         </h:column>    </t:dataTable>    </h:panelGroup>      thanks in advance     jyothish Venu