winform panel增加滚动条

注册控件增加事件

this.plCenter.ControlAdded += PlCenter_ControlAdded;

private void PlCenter_ControlAdded(object sender, ControlEventArgs e)
{
    plCenter.AutoScroll = true;
    plCenter.VerticalScroll.Enabled = true;
    plCenter.VerticalScroll.Visible = true;
    plCenter.Scroll += PlCenter_Scroll;
}

private void PlCenter_Scroll(object sender, ScrollEventArgs e)
{
    this.plCenter.VerticalScroll.Value = e.NewValue;
}