C# treeview同一层级新建两个节点，显示图片

   private void toolStripMenuItem1_Click_1(object sender, EventArgs e)
        {
            //在Tree选择节点的同一级添加节点
            treeView1.LabelEdit = true;
            TreeNode CurrentNode = treeView1.SelectedNode.Nodes.Add("elements");
            CurrentNode.Tag = "withoutsub";
            //更新选择节点
            treeView1.SelectedNode.Checked = false;
            CurrentNode.Checked = true;
            //使添加的树节点处于可编辑的状态
            CurrentNode.BeginEdit();
        }

treeview同一层级新建两个节点，双击两个节点，触发不同的事件，我是通过Tag标记的方式实现的。现在我新建elements_with_sub这个节点，前面显示图片，新建elements前面不显示图片，怎么操作？ 全部显示图片我知道怎么做 添加imagelist 绑定，单独只给某一个节点添加图片怎么做？C

必须要图片，只能用一个空的代替

 using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Q691877
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            imageList1.Images.Add("default", new Bitmap(16, 16));
            treeView1.ImageList = imageList1;
            treeView1.ImageKey = "default";
            treeView1.Nodes.Add(new TreeNode() { Text = "ImplementationDataTypes", Name = "r1" });
            treeView1.Nodes["r1"].Nodes.Add(new TreeNode() { Text = "elements", Name = "l1", ImageIndex = 1, SelectedImageIndex = 1 });
            treeView1.Nodes["r1"].Nodes.Add(new TreeNode() { Text = "elements_with_sub", Name = "l2" });
        }
    }
}