WPF-ContextMenu模板绑定数据失败；

一、原代码：

  XAML：

            <TreeView x:Name="trvwProjectList"  Margin="0,0,0,0" VerticalAlignment="Stretch" VerticalContentAlignment="Stretch" BorderBrush="DarkGray" BorderThickness="0.7">
                <TreeView.Resources>
                    <HierarchicalDataTemplate DataType="{x:Type vModelLocal:Project_TreeNodes}" ItemsSource="{Binding ChildNodes}">
                        <!-- MouseRightButtonDown="ProjectListMenu_MouseRightButtonDown" -->
                        <StackPanel Orientation="Horizontal" Tag="{Binding NodeName}" MouseLeftButtonDown="ProjectListMenu_MouseLeftButtonDown" VerticalAlignment="Stretch" Margin="0">
                            <Label Content="{Binding NodeName}" Tag="{Binding NodeID}" ToolTip="{Binding NodeDescribe}" Background="White" Style="{DynamicResource LabelStyle1}" BorderThickness="0" VerticalContentAlignment="Top">
                                <!-- 右键菜单 -->
                                <Label.ContextMenu>
                                    <ContextMenu StaysOpen="true" ItemsSource="{Binding Path = Menus}"/>
                                </Label.ContextMenu>
                            </Label>
                        </StackPanel>
                    </HierarchicalDataTemplate>
                </TreeView.Resources>
            </TreeView>

  C#：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;

namespace ProjectViewModel
{
    /// <summary>
    /// Tree列表
    /// </summary>
    public class Project_TreeNodes
    {
        /// <summary>
        /// 节点Id
        /// </summary>
        public int NodeID { get; set; }
        /// <summary>
        /// 节点名
        /// </summary>
        public string NodeName { get; set; } = string.Empty;

        /// <summary>
        /// 节点描述
        /// </summary>
        public string NodeDescribe { get; set; } = string.Empty;

        /// <summary>
        /// 父节点Id
        /// </summary>
        public int ParentID { get; set; }

        /// <summary>
        /// 图标
        /// </summary>
        public string Img { get; set; };

        /// <summary>
        /// 右键菜单
        /// </summary>
        public ContextMenu Menus=new();

        /// <summary>
        /// 子元素
        /// </summary>
        public List<Project_TreeNodes> ChildNodes { get; set; } = new();
    }
    
    public 页面代码(){
          trvwProjectList.ItemsSource = new Project_TreeNodes(){...};
    }
}

  错误信息：“在类型为 Project_TreeNodes 的对象上找不到 Menus 属性。 ”

二、分析：

1、原因：

2、修改：