给groupBox添加滚动条

 public Form3()
        {
            InitializeComponent();
            foreach (Control gbox in groupBox1.Controls)
            {
                if (gbox is VScrollBar) continue;
                gbox.Tag = gbox.Location.Y;
            }
            panelControl1.VerticalScroll.Value = panelControl1.VerticalScroll.Maximum;   
        }

然后加入一个垂直滚动条控件，并添加如下事件：

 private void vScrollBar1_Scroll(object sender, ScrollEventArgs e)
        {
            foreach (Control gbox in groupBox1.Controls)
            {
                if (gbox is VScrollBar) continue;
                gbox.Location = new Point(gbox.Location.X, (int)gbox.Tag - e.NewValue);
            }
        }

注意：给groupbox 的父panel 设置AutoScroll=true