How can we set icon to a tree table

Hi ADF Experts,
The below is regarding skinning of af:tree table component.
How can we set icon to a tree table
Below is the af:tree component. When I run the application I see all the parent and child nodes as folder icon. My question is how can set a file icon to the elements present inside a parent node.
  <af:treeTable value="#{pageFlowScope.MerchandizeTreeModel.productTreeModel}"
                                  id="tt1" var="row"
                                  rowSelection="multiple"
                                  horizontalGridVisible="false"
                                  verticalGridVisible="false">
                      <f:facet name="nodeStamp">
                        <af:column sortable="false" headerText=""
                                   rowHeader="true" id="c11" width="200">
                 <af:panelGroupLayout id="pgl0">
   <af:image source="/images/folder.png" shortDesc="foldericon"
                            id="i1"/>
                  <af:outputText value="#{row.groceryItems}" id="ot11"/>
</af:panelGroupLayout>
                        </af:column>
                      </f:facet>
                    </af:treeTable>
Thanks in advance,
Animesh

Hi Experts,
I am having a tree table component in adf. I have set a folder image for the parent node. How can we set a document image for contents inside a parent node.
Thanks,
Biswa

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