C# user control paint event trigger

Setup for Chessboard:
I have a new Windows Applicaiton in VS 2005 using C#.  Then I added a user control to the project and placed it on the form.  On this control, I want  to draw a grid that resizes.  What triggers the paint event for the control?  There is presently no code in the form.cs file.  The following code is in the user control:  (some lines are commented out while I am working on parts but I can see in debug that this event is not being fired.  I welcome any help on this code and the trigger for it)

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace Chess
{
    public partial class GamePanel : UserControl
    {
        public GamePanel()
        {
            InitializeComponent();

            // bit flag enum
            this.SetStyle(ControlStyles.AllPaintingInWmPaint |
                ControlStyles.UserPaint |
                ControlStyles.DoubleBuffer |
                ControlStyles.ResizeRedraw, true);
        }

        private void GamePanel_Load(object sender, EventArgs e)
        {

        }
       
       
       
        private void GamePanel_Paint(object sender, PaintEventArgs e)
        {
            // string alignment -- center.
            //StringFormat sf = new StringFormat();
            //sf.Alignment = StringAlignment.Center;
            //sf.LineAlignment = StringAlignment.Center;
            //Pen black = new Pen(Color.Black);
           // this.ClientRectangle;
           e.Graphics.DrawLine(Pens.Black,0, 15, 150, 15);  // test drawing a line  

            // anchor control
           // this.ClientRectangle.Right;
           // this.ClientRectangle.Bottom;
           
            // draw grid
            float rowHt = this.ClientRectangle.Height/9;
            for (int row = 1; row < 9; row ++){
                Rectangle r = new Rectangle(0, (int)(row * rowHt),
                    this.ClientRectangle.Width,(int)rowHt);
             e.Graphics.DrawLine(Pens.Black, 0f, rowHt * rowHt, (float)this.ClientRectangle.Width, rowHt * row);      

           
            }
              // Brush base = new SolidBrush Brush(Color, Fromargb(12, 240, 210, 0);

               // e.Graphics.DrawString("TEST TEXT", thisFont, Graphics, 100, 100);  
               
        }

        private void GamePanel_MouseDown(object sender, MouseEventArgs e)
        {

        }

        private void GamePanel_MouseUp(object sender, MouseEventArgs e)
        {

        }
    }
}



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