<Device name="hidc-1600tv _192.168.230.188" ItemType="DVR" type="Onvif" TypeID="" Code="" location="" Description="" ID="" UniqueID="192.168.230.188">
 <IP Value="192.168.230.188" />
 <Port Value="80" />
 <Username Value="admin" />
 <Password Value="1234" />
 <AuthenAddress Value="/" />
 <AuthenMode Value="1" />
 <OnvifUser Value="admin" />
 <OnvifPwd Value="1234" />
 <OnvifAddress Value="/onvif/device_service" />
 <RTSPUser Value="admin" />
 <RTSPPwd Value="1234" />
 <ChildDevices>
  <Device name="" ItemType="Channel" type="" TypeID="" Code="" location="" Description="" id="" UniqueID="">
   <PTZEnable Value="True" />
   <PTZ1 Value="5" />
   <PTZ2 Value="15" />
   <PTZ3 Value="25" />
   <PTZ4 Value="35" />
   <PTZ5 Value="45" />
   <PTZ6 Value="55" />
   <PTZ7 Value="65" />
   <PTZ8 Value="75" />
   <PTZ9 Value="85" />
   <ChildDevices>
    <Device name="" ItemType="RStreamer" type="" TypeID="1" Code="" location="" Description="" id="">
     <MediaProfile Value="1" />
     <Multicast Value="False" />
    </Device>
    <Device name="" ItemType="RStreamer" type="" TypeID="2" Code="" location="" Description="" id="">
     <MediaProfile Value="2" />
     <Multicast Value="False" />
    </Device>
   </ChildDevices>
  </Device>
 </ChildDevices>
</Device>

 public void LoadXmlTree(string xml)
    {
      XDocument xDoc = XDocument.Parse(xml);
      TreeListViewItem item = new TreeListViewItem();
      string title = xDoc.Root.Attribute("name")?.Value ?? xDoc.Root.Name.LocalName;
      item.Text = title;
      item.ImageIndex = 0;
      item.SubItems.Add(xDoc.Root.Attribute("UniqueID")?.Value);
      item.SubItems.Add(xDoc.Root.Attribute("ItemType")?.Value);
      PopulateTree (xDoc.Root, item.Items);
      tvDevice.Items.Add(item);
    }
    public void PopulateTree (XElement element, TreeListViewItemCollection items)
    {
      foreach (XElement node in element.Nodes())
      {
        TreeListViewItem item = new TreeListViewItem();
        string title = node.Name.LocalName.Trim();
        item.Text = title;
        if (title == "Device")
        {
          var attr = node.Attribute("ItemType")?.Value;
          switch (attr)
          {
            case "Channel": item.ImageIndex = 1; break;
            case "RStreamer": item.ImageIndex = 3; break;
            default: break;
          }
          item.SubItems.Add(node.Attribute("UniqueID")?.Value);
          item.SubItems.Add(node.Attribute("ItemType")?.Value);
        }
        else
        {
          item.ImageIndex = 2;
          item.SubItems.Add(node.Attribute("Value")?.Value);
        }
        if (node.HasElements)
        {
          PopulateTree (node, item.Items);
        }
        items.Add(item);
      }
    }

 private void treeListView1_BeforeExpand(object sender, TreeListViewCancelEventArgs e)
    {
      if(e.Item.ImageIndex == 0) e.Item.ImageIndex = 1;
    }

 private void treeListView1_BeforeLabelEdit(object sender, TreeListViewBeforeLabelEditEventArgs e)
    {
      if(e.ColumnIndex == 1)
      {
        ComboBox combobox = new ComboBox();
        combobox.Items.AddRange(new string[]{"Html","Css","Javascript"});
        e.Editor = combobox;
      }
    }