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   源码介绍

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

namespace TreeComboBoxTest
{
	public partial class Form1 : Form
	{
		public Form1()
		{
			InitializeComponent();
			this.treeComboBox1.AfterExpand  = new TreeViewEventHandler(treeComboBox1_AfterExpand);
			this.treeComboBox1.AfterCollapse  = new TreeViewEventHandler(treeComboBox1_AfterCollapse);
			//为下拉列表添加节点
			for (int i = 0; i < 4; i  )
			{
				this.treeComboBox1.Nodes.Add("key"   i, "Depart"   i, 0, 0);
				for (int j = 0; j < i 1; j  )
				{
					this.treeComboBox1.Nodes[i].Nodes.Add("key_child"   i j, "User"   i j, 2, 2);
				}
			}
		}

		void treeComboBox1_AfterCollapse(object sender, TreeViewEventArgs e)
		{
			if (e.Node.ImageIndex == 1)
				e.Node.ImageIndex = e.Node.SelectedImageIndex = 0;
			
		}

		void treeComboBox1_AfterExpand(object sender, TreeViewEventArgs e)
		{
			if (e.Node.ImageIndex == 0)
				e.Node.ImageIndex = e.Node.SelectedImageIndex = 1;
		}
	}
}