Panel的滚动条出现焦点问题[.NET2.0]
Panel里放了一个比较大的控件使Panel出现滚动条。且Panel里的控件可以有输入焦点，如(ListBox)。

问题出现的操作步骤：
1.将Panel的滚动条拖到下面。
2.点一下同Form的其他控件，使Panel里的控件没有焦点。
3.点击Panel里的控件，使其获得焦点。问题出现：这时Panel的滚动条会跳回到初始处。

请问这个问题怎么解决？大家遇到过吗？

C# code

using System;using System.Collections.Generic;using System.ComponentModel;using System.Drawing;using System.Text;using System.Windows.Forms;public partial class TestForm : Form{    static public void Main()    {        Application.Run(new TestForm());    }    public TestForm()    {        InitializeComponent();    }    private System.Windows.Forms.Panel panel1;    private System.Windows.Forms.TextBox textBox2;    private System.Windows.Forms.TextBox textBox1;    private void InitializeComponent()    {        this.panel1 = new System.Windows.Forms.Panel();        this.textBox1 = new System.Windows.Forms.TextBox();        this.textBox2 = new System.Windows.Forms.TextBox();        this.panel1.SuspendLayout();        this.SuspendLayout();        //         // panel1        //         this.panel1.AutoScroll = true;        this.panel1.BorderStyle = System.Windows.Forms.BorderStyle.FixedSingle;        this.panel1.Controls.Add(this.textBox2);        this.panel1.Location = new System.Drawing.Point(22, 35);        this.panel1.Name = "panel1";        this.panel1.Size = new System.Drawing.Size(138, 193);        this.panel1.TabIndex = 0;        //         // textBox1        //         this.textBox1.Location = new System.Drawing.Point(180, 62);        this.textBox1.Name = "textBox1";        this.textBox1.Size = new System.Drawing.Size(100, 21);        this.textBox1.TabIndex = 1;        //         // textBox2        //         this.textBox2.Location = new System.Drawing.Point(16, 12);        this.textBox2.Multiline = true;        this.textBox2.Name = "textBox2";        this.textBox2.Size = new System.Drawing.Size(148, 255);        this.textBox2.TabIndex = 0;        this.textBox2.Text = "\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n\r\n";        //         // TestForm        //         this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);        this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;        this.ClientSize = new System.Drawing.Size(292, 266);        this.Controls.Add(this.textBox1);        this.Controls.Add(this.panel1);        this.Name = "TestForm";        this.Text = "TestForm";        this.panel1.ResumeLayout(false);        this.panel1.PerformLayout();        this.ResumeLayout(false);        this.PerformLayout();    }}