when I add or remove a node , the tree don`t automatic reload. After  I use richfaces 4 , and I like to set a different icon for Node there are currently selected,it don`t work correctly. could I have any suggestions?

that ist my tree:

<t:fieldset style="width:20em;" styleClass="odd">

                    <rich:tree id="klassenTree" styleClass="klassenTree"

                        style="width:200px;" nodeFace="#{item.face}"

                        nodeSelectListener="#{pc.processSelection}"

                        reRender="buchungskonten" ajaxSubmitSelection="true"

                        switchType="server" value="#{pc.treeNode}" var="item"

                        ajaxKeys="#{null}" toggleOnClick="true" >

                        <rich:treeNode type="node" icon="/weblets/icons/cprj_obj.gif"

                            iconLeaf="/weblets/icons/cprj_obj.gif" >

                            <h:outputText value="#{item.name}" />

                        </rich:treeNode>

                        <rich:treeNode type="folder"  rendered="#{item.name==workflow.value.name or item.name==workflow.value.parent.name }"

                            icon="/weblets/icons/folder.gif"

                            iconLeaf="/weblets/icons/folder.gif" >

                            <h:outputText value="#{item.name}" />

                        </rich:treeNode>

                        <rich:treeNode type="folder" rendered="#{item.name!=workflow.value.name and item.name!=workflow.value.parent.name }"

                            icon="/weblets/icons/closedFolder.gif"

                            iconLeaf="/weblets/icons/closedFolder.gif">

                            <h:outputText value="#{item.name}" />

                        </rich:treeNode>

                    </rich:tree>