How to insert additional culumn header using dataTable

["nvduc_82@yahoo.com" <nv...@yahoo.com>]

Hi everyone, I am using MyFaces 1.1.3, tomahawk 1.1.3, tomahawk-sandbox 1.1.5

I have to add one column header "Proficiency" as in image  

http://www.nabble.com/file/p17206601/screenshot.jpg 

This is JSF code without "Proficiency"
<t:dataTable id="data" value="#{commonBean.tableList}"
styleClass="standardTable" headerClass="table_header"
rowClasses="table_row1, table_row2"
columnClasses="standardTable_Checkbox_Column,standard_text,standardTable_Checkbox_Column,standardTable_Checkbox_Column"
var="value" preserveSort="true" rows="10" width="100%" border="0"
sortColumn="#{commonBean.sortColumn}"
sortAscending="#{commonBean.ascending}" cellpadding="2" cellspacing="1"
rowIndexVar="tableRowIndex">
							
				<h:column>
					<f:facet name="header">
						<h:panelGrid styleClass="table_header2">
							<h:outputText value="#{msg['select']}" />
						</h:panelGrid>
					</f:facet>
					<h:selectBooleanCheckbox id="select" value="#{value.select}" />
				</h:column>
				<h:column>
									
					<f:facet name="header">
						<t:commandSortHeader columnName="languageSkill" arrow="true"
styleClass="table_header">
							<h:outputText value="#{msg['language.skill']}" />
						</t:commandSortHeader>
					</f:facet>
					<h:commandLink action="#{commonBean.editAction}"
actionListener="#{commonBean.editActionListener}">
						<h:outputText value="#{value.languageSkill}" />
					</h:commandLink>
					<f:param id="object" value="#{value}" />
				</h:column>
				<h:column>
					<f:facet name="header">						
						<h:outputText value="#{msg['spoken']}" />
					</f:facet>
					<h:outputText value="#{value.spokenDescription}"
styleClass="standardText"/>
				</h:column>
				<h:column>
					<f:facet name="header">
						<h:outputText value="#{msg['written']}" />
					</f:facet>
					<h:outputText value="#{value.writtenDescription}"
styleClass="standardText"/>			
				</h:column>
			</t:dataTable>

			
How to do ? 
Thanks for your help
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