如何在Button.OnPaint中绘制悬停和鼠标按下的颜色

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

public class CustomButton : Button
{
    private bool isHovered = false;
    private bool isPressed = false;

    protected override void OnMouseEnter(EventArgs e)
    {
        base.OnMouseEnter(e);
        isHovered = true;
        Invalidate(); // 重绘按钮
    }

    protected override void OnMouseLeave(EventArgs e)
    {
        base.OnMouseLeave(e);
        isHovered = false;
        Invalidate(); // 重绘按钮
    }

    protected override void OnMouseDown(MouseEventArgs mevent)
    {
        base.OnMouseDown(mevent);
        isPressed = true;
        Invalidate(); // 重绘按钮
    }

    protected override void OnMouseUp(MouseEventArgs mevent)
    {
        base.OnMouseUp(mevent);
        isPressed = false;
        Invalidate(); // 重绘按钮
    }

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

        // 绘制悬停和鼠标按下的颜色
        if (isHovered)
        {
            pevent.Graphics.FillRectangle(Brushes.LightBlue, ClientRectangle);
        }
        if (isPressed)
        {
            pevent.Graphics.FillRectangle(Brushes.LightCoral, ClientRectangle);
        }
    }
}