How to extend the native MessageBox dialog in .NET

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

namespace CoderSky.Demonstration.Windows
{
	public partial class MessageBoxDemoForm : Form
	{
		public MessageBoxDemoForm()
		{
			InitializeComponent();

			propertyGrid1.SelectedObject = messageBox1;
		}

		private void show_Click(object sender, EventArgs e)
		{
			DialogResult result = messageBox1.ShowDialog(this);

			dialogResult.Text = result.ToString();
			timedOut.Text = messageBox1.IsTimedOut.ToString();

			propertyGrid1.SelectedObject = messageBox1;

		}
	}
}