Devexpress TreeList 展开和折叠当前选中节点

1.展开：

        private void barButtonItem6_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            ParentNodeExpend(treeListEstateInfo.FocusedNode);
        }
        /// <summary>
        /// 展开当前节点及父节点
        /// </summary>
        /// <param name="_node"></param>
        public void ParentNodeExpend(TreeListNode node)
        {
            TreeListNode _cNode = node;
            treeListEstateInfo.Nodes.TreeList.FindNodeByID(_cNode.Id).Expanded = true;
            while (_cNode.ParentNode != null)
            {
                treeListEstateInfo.Nodes.TreeList.FindNodeByID(_cNode.ParentNode.Id).Expanded = true;
                _cNode = _cNode.ParentNode;
            }
        }

2.折叠

        private void barButtonItem7_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            CloseFocuseNode(treeListEstateInfo.FocusedNode);
        }
        /// <summary>
        /// 折叠当前选中节点
        /// </summary>
        /// <param name="_node"></param>
        public void CloseFocuseNode(TreeListNode node)
        {
            treeListEstateInfo.Nodes.TreeList.FindNodeByID(node.Id).Expanded = false;
        }