用struts能做二级菜单吗?

在struts-config.xml中定义struts-menu插件,定义语句如下:
    <plug-in className="net.sf.navigator.menu.MenuPlugIn">
             <set-property property="menuConfig" value="/WEB-INF/menu-config.xml"/>
    </plug-in>
在menu-config.xml中定义菜单项,定义遇句如下:
   <Menu  name="ToDoListMenuFile"  title="FILE"  description="test" width="50">
       <Item   name="TDLnew"   title="NEW">
           <Item   name="TDLnewcase"   title="CASE"    image="images/case-new.png"
                   location="NewCase.jsp"/>
           <Item   name="TDLnewitem"    title="ITEM"   image="images/item-new.png"
                   location="index.jsp"/>
           <Item   name="TDLnewparty"   title="PARTY"  image="images/party-new.png"
                   location="index.jsp"/>
       </Item>
       <Item   name="TDLopen"   title="OPEN">
           <Item   name="TDLopencase"    title="CASE"   image="images/case-open.png"
                    location="index.jsp"/>
           <Item   name="TDLopenitem"   title="ITEM"    image="images/item-open.png"
                    location="index.jsp"/>
           <Item   name="TDLopenparty"  title="PARTY"   image="images/party-open.png"
                    location="index.jsp"/>
       </Item>
       <Item    name="TDLexit"  title="EXIT"
                image="images/exit.png"   location="index.jsp"/>
    </Menu>
以上代码定义了一个菜单名为ToDoListMenuFile,标题为FILE的菜单,属于一个多级级联菜单.
在JSP页面调用的代码如下所示:
<menu:useMenuDisplayer name="DropDown" bundle="org.apache.struts.action.MESSAGE">
    <table cellpadding=0 cellspacing=0>
      <tr>
        <td>
          <menu:displayMenu name="ToDoListMenuFile" target="filewindow"/>
        </td>
      </tr>
      <tr>
        <td>
          <menu:displayMenu name="ToDoListMenuEdit"/>
        </td>
      </tr>
      <tr>
        <td>
          <menu:displayMenu name="CaseDetailMenuCase"/>
        </td>
      </tr>
    </table>
    </menu:useMenuDisplayer>