介于树节点的展开与收缩是经常多处使用的，这里就写个两个调用方法。

        /// <summary>
        /// 展开指定节点以及其父节点
        /// </summary>
        /// <param name="tree">树</param>
        /// <param name="appointNode">要展开的节点</param>
        public static void ExpandAppointTreeNode(this TreeList tree, TreeListNode appointNode)
        {
            tree.Nodes.TreeList.FindNodeByID(appointNode.Id).Expanded = true;
            while (appointNode.ParentNode != null)
            {
                tree.Nodes.TreeList.FindNodeByID(appointNode.ParentNode.Id).Expanded = true;
                appointNode = appointNode.ParentNode;
            }
        }
        /// <summary>
        /// 收缩指定节点
        /// </summary>
        /// <param name="tree">树</param>
        /// <param name="appointNode">要收缩的节点</param>
        public static void ShrinkAppointTreeNode(this TreeList tree, TreeListNode appointNode)
        {
            tree.Nodes.TreeList.FindNodeByID(appointNode.Id).Expanded = false;
        }

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