是否可以在winforms中为滚动条添加书签？

using System;
using System.Drawing;
using System.Windows.Forms;

public class BookmarkScrollBar : ScrollBar
{
    private Rectangle bookmarkRect;

    public BookmarkScrollBar()
    {
        bookmarkRect = new Rectangle();
    }

    protected override void OnPaint(PaintEventArgs e)
    {
        base.OnPaint(e);

        // 绘制书签
        if (bookmarkRect != Rectangle.Empty)
        {
            e.Graphics.FillRectangle(Brushes.Red, bookmarkRect);
        }
    }

    protected override void OnMouseDown(MouseEventArgs e)
    {
        base.OnMouseDown(e);

        // 点击书签时触发相应的操作
        if (bookmarkRect.Contains(e.Location))
        {
            // 执行跳转到书签位置的操作
            // TODO: 添加你的代码
        }
    }

    protected override void OnLayout(LayoutEventArgs levent)
    {
        base.OnLayout(levent);

        // 计算书签的位置
        int bookmarkWidth = 10; // 书签的宽度
        int bookmarkHeight = Height; // 书签的高度
        int bookmarkX = (int)((float)(Value - Minimum) / (Maximum - Minimum) * (Width - bookmarkWidth));
        int bookmarkY = 0;
        bookmarkRect = new Rectangle(bookmarkX, bookmarkY, bookmarkWidth, bookmarkHeight);
    }
}

public class MainForm : Form
{
    private BookmarkScrollBar scrollBar;

    public MainForm()
    {
        scrollBar = new BookmarkScrollBar();
        Controls.Add(scrollBar);
    }
}

public class Program
{
    [STAThread]
    public static void Main()
    {
        Application.Run(new MainForm());
    }
}