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;
         }