Struts2 - <s:tree>

<s:tree theme="ajax"
        rootNode="%{rootNode}"
        childCollectionProperty="children"
        nodeIdProperty="id"
        nodeTitleProperty="name">
	
</s:tree>

public String show(){
    	
    	TreeModel tm = new TreeModel();
    	
    	tm.set_id(new Long(56));
    	tm.set_name("aaaaa");
    	
    	set_rootNode(tm);
    	
    	return SUCCESS;
    }