如何获取PrimeFaces树节点的根？

<p:tree id="myTree" value="#{bean.treeModel}" var="node">
    <!-- 树节点的内容 -->
</p:tree>

private TreeNode treeModel;

public void initTree() {
    // 创建根节点
    TreeNode root = new DefaultTreeNode("Root", null);
    
    // 添加子节点
    TreeNode child1 = new DefaultTreeNode("Child 1", root);
    TreeNode child2 = new DefaultTreeNode("Child 2", root);
    
    // 将根节点设置到树模型中
    treeModel = root;
}

public TreeNode getTreeModel() {
    return treeModel;
}

UIComponent treeComponent = FacesContext.getCurrentInstance().getViewRoot().findComponent("myTree");
if (treeComponent instanceof Tree) {
    Tree tree = (Tree) treeComponent;
    TreeNode rootNode = tree.getValue().getRoot();
    // 对根节点进行操作
}