C# WinForm TreeView改变选中节点颜色，失去焦点选中节点仍突显

绑定TreeView：

 /// <summary>加载职位列表</summary>
        private void LoadPostList()
        {
            this.tvwPost.Nodes.Clear();
            List<Post> lstPost = new Post().SelectList();
            TreeNode objTreeNode = new TreeNode();
            objTreeNode.Name = "0";
            objTreeNode.Text = "显示全部";
            foreach (Post obj in lstPost)
            {
                objTreeNode.Nodes.Add(obj.ID.ToString(), obj.Name);
            }
            this.tvwPost.Nodes.Add(objTreeNode);
            this.tvwPost.ExpandAll();
        }

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