Richfaces component

// JSF PART
 
                        <rich:panel id="serv" >
                            <f:facet name="header">
                                I want<br/>
                            </f:facet>
                            <h:panelGrid columns="2" width="100%" columnClasses="col" >
                                <rich:tree id="treetake" switchType="ajax" ajaxSubmitSelection="true" nodeSelectListener="#{AddDeal.processSelection}" >
                                    <rich:recursiveTreeNodesAdaptor roots="#{AddDeal.rootCat}" var="item" nodes="#{item.catServiceCollection}" />
                                </rich:tree>
                                
                                <a4j:outputPanel id="ajxpn1" ajaxRendered="true">     
                                    <h:selectOneListbox id="listservtake"  rendered="#{AddDeal.serv!=null}" value="#{AddDeal.currentService}">
                                        <f:selectItems  value="#{AddDeal.serv}"/>
                                    </h:selectOneListbox>
                                </a4j:outputPanel>
                            </h:panelGrid>
                        </rich:panel>
                        
                        <rich:panel id="moreinfo">
                            <f:facet name="header">
                                Choosed services<br/>
                            </f:facet>
                            <a4j:commandButton value="Request this service" reRender="rep1" >
                                <a4j:actionparam name="username" value="#{AddDeal.currentService}" assignTo="#{AddDeal.deal.idRequestedService}"/>
                            </a4j:commandButton>
                            <h:outputText id="rep1" value="#{AddDeal.deal.idRequestedService}"/>
                        </rich:panel>
 
 
 
//the bean part:
//I dont display getters and setters that haven't anything special
 
    public void processSelection(NodeSelectedEvent event) {//TODO check if it's a final node
        HtmlTree tree = (HtmlTree) event.getComponent();
        this.serv= ((CatService) tree.getRowData()).getServiceCollection();
    }
 
    public Collection<SelectItem> getServ(){
        if(this.serv == null || this.serv.size()==0) return null;
        
        ArrayList<SelectItem> col = new ArrayList<SelectItem>();        
        for(Service s: this.serv){
            col.add(new SelectItem(s));
        }
        return col;
    }
 
    public Deal getDeal() {
        if(deal ==null)
            deal = new Deal();
        return deal;
    }

                                  

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