如何在oracle webcenter portal中列出选定节点的子节点

我需要为我的oracle webcenter门户项目添加额外的导航。此附加导航应在导航栏中显示选定节点的子节点。此外，此附加导航应该位于左侧边栏中。我该怎么做？

     <af:panelGroupLayout layout="vertical">

 <c:forEach var="node" varStatus="vs" items="#{navigationContext.currentModel.listModel['startNode=/, includeStartNode=false']}">
        <c:if test="${node.selected}">
            <c:set value="${node.children}" var="childNodes" scope="session"/>
        </c:if>               
</c:forEach>

<c:if test="${childNodes ne null}">
    <c:set var="childNodes" value="${navigationContext.currentModel.currentSelection.parent.children}"/>
</c:if>
<c:forEach items="#{childNodes}" var="node2">
                <af:commandImageLink id="cil3" text="#{node2.title}"
                                     actionListener="#{navigationContext.processAction}"
                                     action="pprnav"
                                     icon="#{node2.attributes[pageFlowScope.tnBean.iconKey]}"
                                     disabled="#{not node2.navigable}"
                                     inlineStyle="#{node2.onSelectedPath ? 'font-weight:bold;' : ''}">
                  <f:attribute name="node" value="#{node2}"/>
                </af:commandImageLink>
</c:forEach>

</af:panelGroupLayout>