Problème affichage icon dans treeView

Bonjour,

j'essaie de personnaliser les icons d'un treeView.
Le code est:

Code:

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<f:view>
 
 
	<h:form>
		<rich:tree value="#{rf4351.treeNode}" var="item" switchType="ajax"
			rowKeyConverter="org.richfaces.TreeRowKeyConverter" nodeFace="#{item.type}">
			<rich:treeNode ajaxSingle="true" type="a" iconLeaf="/images/close.png" icon="/images/tree/disc.png">
				<h:outputText value="#{item.attributes[des]}" />
				<a4j:commandLink ajaxSingle="true" value="link" />
			</rich:treeNode>
			<rich:treeNode ajaxSingle="true" type="b"  iconLeaf="/images/close.png" icon="/images/tree/disc.png">
				<h:outputText value="#{item.attributes[cod]}" />
				<a4j:commandLink ajaxSingle="true" value="link" />
			</rich:treeNode>
 
 
		</rich:tree>
 
 
 
	</h:form>
</f:view>

Le problème est que l'arbre s'affiche mais pas les icons dont j'ai précisé le path.

Est ce que quelqu'un a une idée???

J'ai remarqué que var=#{item}: le item est considéré comme String et non pas comme un objet!!!!
Est ce que quelqu’un a une idée sur la manière de convertir item en objet???

Quand je veux attribuer à nodeFace un valeur, l'erreur dans le console m'indique que item est un string.
Voici l'erreur:

Code:

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1 févr. 2011 15:45:31 com.sun.facelets.FaceletViewHandler handleRenderException
GRAVE: Error Rendering View[/pages/testRf-4351.xhtml]
javax.faces.FacesException: javax.el.PropertyNotFoundException: /pages/testRf-4351.xhtml @14,121 nodeFace="#{item.des}": Property 'des' not found on type java.lang.String
	at org.richfaces.component.html.HtmlTree.getNodeFace(HtmlTree.java:1202)
	at org.richfaces.component.UITree.getNodeFacet(UITree.java:292)
	at org.richfaces.component.UITree.dataChildren(UITree.java:520)
	at org.ajax4jsf.component.UIDataAdaptorBase.saveChildState(UIDataAdaptorBase.java:912)
	at org.ajax4jsf.component.UIDataAdaptorBase.setRowKey(UIDataAdaptorBase.java:345)
	at org.richfaces.renderkit.TreeRendererBase.writeContent(TreeRendererBase.java:688)
	at org.richfaces.renderkit.TreeRendererBase.encodeChildren(TreeRendererBase.java:629)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
	at javax.faces.render.Renderer.encodeChildren(Renderer.java:148)
	at javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:837)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:930)
	at javax.faces.component.UIComponent.encodeAll(UIComponent.java:933)
	at com.sun.facelets.FaceletViewHandler.renderView(FaceletViewHandler.java:594)
	at org.ajax4jsf.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:100)
	at org.ajax4jsf.application.AjaxViewHandler.renderView(AjaxViewHandler.java:176)
	at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:110)
	at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:100)
	at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
	at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.ajax4jsf.webapp.BaseXMLFilter.doXmlFilter(BaseXMLFilter.java:206)
	at org.ajax4jsf.webapp.BaseFilter.handleRequest(BaseFilter.java:290)
	at org.ajax4jsf.webapp.BaseFilter.processUploadsAndHandleRequest(BaseFilter.java:388)
	at org.ajax4jsf.webapp.BaseFilter.doFilter(BaseFilter.java:515)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:845)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
	at java.lang.Thread.run(Unknown Source)

L'attribut item normalement représente un objet.