problem with richfaces tree menu

[safa]

Good Morning,
I'm trying to create a tree menu with richfaces, but the menu wasn't shown


My JSF code:

<a4j:form>
<rich:tree style="width:300px"
 value="#{parc.tree}" var="item">
 <rich:treeNode>

 <h:outputText value="#{item.id}" />
 </rich:treeNode>
 </rich:tree>
 </a4j:form>

My ParcList Class:

@Name("parcList")
public class ParcList extends EntityQuery {

 private static final String[] RESTRICTIONS = {};

 private Parc parc = new Parc();

 @Override
 public String getEjbql() {
 return "select parc from Parc parc";
 }

 @Override
 public Integer getMaxResults() {
 return 25;
 }

 public Parc getParc() {
 return parc;
 }

 @Override
 public List<String> getRestrictions() {
 return Arrays.asList(RESTRICTIONS);
 }



 @In EntityManager entityManager;
 TreeNodeImpl parcTree=null;
 public void setTree(){

 List<Parc> parc = entityManager.createQuery("from Parc").getResultList();
 Iterator iter = parc.iterator();
 while (iter.hasNext()) {

 parcTree.addChild((Parc)iter.next(), parcTree);
 }
 }

 public List getTree(){
 List <Parc> parcs = (List<Parc>) parcTree;
 return parcs;
 }


}

and My entity class:

@Entity
@Table(name = "parc", schema = "public")
public class Parc implements java.io.Serializable {

 private int id;
 private AireProtegee aireProtegee;
}

I use seam 2.0.3

I really need your help,
thx

[ilya_shaikovsky]

 parcTree.addChild((Parc)iter.next(), parcTree);

you believe that adding the node to itself is correct?

[safa]

thx for replying first,
I don't think that this code is really correct and coherent. can you help me to correcte it?!!
or if you have same other idea, it 'll be helpful!!
thx

[ilya_shaikovsky]

such simple examples could be checked at demosite. source could be downloaded and freely used. follow the link at my signature.

[safa]

thanks for your help,
I have already visited the most of this links

[ilya_shaikovsky]

I think it will be simplier to check out the code itself and play a bit with it.