<ice:tree id="tree"
                           value="#{Tree.model}"
                           var="item"
                           hideRootNode="#{false}"
                           hideNavigation="#{false}">
                     <ice:treeNode>
                         <f:facet name="content">
                             <ice:panelGroup style="display: inline; #{node.userObject.selected ? 'background-color: white' : 'background-color: black'}">
                                 <ice:commandLink
                                         actionListener="#{item.userObject.selectNode}">
                                     <ice:outputText value="#{item.userObject.text}" />
                                     <f:param name="id" value="#{item.userObject.id}"/>
                                     <f:ajax execute="@this" render="@all" />
                                 </ice:commandLink>
                             </ice:panelGroup>
                         </f:facet>
                     </ice:treeNode>
                 </ice:tree>
 

     public void selectNode(ActionEvent action){
 ...
     }