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;
}

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);
}
}