关于窗体的问题
一个MDI主窗体MDIform,被分成左右两部分,左边为树,点击树节点时右面显示相应的子窗体(form1),子窗体上有按扭button,点击button,增加一个树节点,当前的字窗体(form1)关闭,同时另一个子窗体(form2)显示,请问怎么实现?

------解决方案--------------------
有点意思:用.net2003实现
Form1主窗体 Form2子窗体

Form1:
----------------------------------------------------
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace TestTree
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.TreeView treeView1;
private System.Windows.Forms.Splitter splitter1;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.treeView1 = new System.Windows.Forms.TreeView();
this.splitter1 = new System.Windows.Forms.Splitter();
this.SuspendLayout();
//
// treeView1
//
this.treeView1.Dock = System.Windows.Forms.DockStyle.Left;
this.treeView1.ImageIndex = -1;
this.treeView1.Location = new System.Drawing.Point(0, 0);
this.treeView1.Name = "treeView1 ";
this.treeView1.Nodes.AddRange(new System.Windows.Forms.TreeNode[] {
new System.Windows.Forms.TreeNode( "子窗口 ", new System.Windows.Forms.TreeNode[] {
new System.Windows.Forms.TreeNode( "form21 "),
new System.Windows.Forms.TreeNode( "form22 ")})});
this.treeView1.SelectedImageIndex = -1;
this.treeView1.Size = new System.Drawing.Size(121, 366);
this.treeView1.TabIndex = 1;
this.treeView1.AfterSelect += new System.Windows.Forms.TreeViewEventHandler(this.treeView1_AfterSelect);
//
// splitter1
//
this.splitter1.Location = new System.Drawing.Point(121, 0);
this.splitter1.Name = "splitter1 ";
this.splitter1.Size = new System.Drawing.Size(3, 366);
this.splitter1.TabIndex = 2;
this.splitter1.TabStop = false;
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(520, 366);
this.Controls.Add(this.splitter1);
this.Controls.Add(this.treeView1);
this.IsMdiContainer = true;
this.Name = "Form1 ";
this.Text = "Form1 ";
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void treeView1_AfterSelect(object sender, Syst