Uhm, why isn't this working for the picture viewer tutorial?

For the end of http://msdn.microsoft.com/en-us/library/dd492148.aspx tutorial, my background, clear, and close buttons do not work? Here is my ending code

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

namespace PictureViewer
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void tableLayoutPanel1_Paint(object sender, PaintEventArgs e)
        {

        }

        private void clearButton_Click(object sender, EventArgs e)
        {
            // Clear the picture.
            pictureBox1.Image = null;
        }

        private void backgroundButton_Click(object sender, EventArgs e)
        {
            // Show the color dialog box. If the user clicks OK, change the 
            // PictureBox control's background to the color the user chose. 
            if (colorDialog1.ShowDialog() == DialogResult.OK)
                pictureBox1.BackColor = colorDialog1.Color;
        }

        private void closeButton_Click(object sender, EventArgs e)
        {
            // Close the form. 
            this.Close();
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            // If the user selects the Stretch check box,  
            // change the PictureBox's 
            // SizeMode property to "Stretch". If the user clears 
            // the check box, change it to "Normal".
            if (checkBox1.Checked)
                pictureBox1.SizeMode = PictureBoxSizeMode.StretchImage;
            else
                pictureBox1.SizeMode = PictureBoxSizeMode.Normal;
        }

        private void showButton_Click(object sender, EventArgs e)
        {
            // Show the Open File dialog. If the user clicks OK, load the 
            // picture that the user chose.
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Load(openFileDialog1.FileName);
            }
        }
    }
}

I am using Visual C#.