发一个带三态复选框的TreeView[源自sourceforge.net]

样式如下图！

// ---------------------------------------------------------------------------------------------
//
// File: TriStateTreeView.cs
// Responsibility: Eberhard Beilharz/Tim Steenwyk
//
// <remarks>
// </remarks>
// ---------------------------------------------------------------------------------------------
using System;
using System.Collections;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace xxx

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