Tray icon app + BackgroundWorker

using System;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Threading;
using System.Windows.Forms;

namespace Systraytest
{
    public partial class Form1 : Form, IDisposable
    {
        private readonly NotifyIcon _icon;
        private readonly ContextMenu _trayMenu;
        private BackgroundWorker _worker;

        private readonly MenuItem _startItem;
        private readonly MenuItem _stopItem;
        private readonly MenuItem _exitItem;

        public Form1()
        {
            InitializeComponent();

            _startItem = new MenuItem("Start", OnStartClicked);
            _stopItem = new MenuItem("Stop", OnStopClicked);
            _exitItem = new MenuItem("Exit", OnExitClicked);

            _trayMenu = new ContextMenu();
            SetupTrayMenu(false);

            _icon = new NotifyIcon();
            _icon.Text = "SysTrayTest";
            _icon.Icon = new Icon(SystemIcons.Application, 40, 40);
            _icon.ContextMenu = _trayMenu;
            _icon.Visible = true;
            SetupWorker();
        }

        private void SetupWorker()
        {
            _worker = new BackgroundWorker();
            _worker.WorkerSupportsCancellation = true;
            _worker.DoWork += (s, ea) =>
            {
                var worker = s as BackgroundWorker;

                Debug.WriteLine("BWorker started!");
                while (!worker.CancellationPending)
                {
                    Debug.WriteLine("PFFFT");
                    Thread.Sleep(1000);
                }

                Debug.WriteLine("BWorker canceled!");
            };

            _worker.RunWorkerCompleted += (s, ea) =>
            {
                Debug.WriteLine("BWorker completed!");
                SetupTrayMenu(false);
            };
        }

        private void SetupTrayMenu(bool running)
        {
            _trayMenu.MenuItems.Clear();
            _trayMenu.MenuItems.Add(running ? _stopItem : _startItem);
            _trayMenu.MenuItems.Add(_exitItem);
        }

        private void OnStartClicked(object sender, EventArgs e)
        {
            _worker.RunWorkerAsync();
            SetupTrayMenu(true);
        }

        private void OnStopClicked(object sender, EventArgs e)
        {
            _worker.CancelAsync();
        }

        private void OnExitClicked(object sender, EventArgs e)
        {
            if (_worker.IsBusy && !_worker.CancellationPending)
            {
                _worker.CancelAsync();
            }

            Application.Exit();
        }

        protected override void OnLoad(EventArgs e)
        {
            Visible = false;
            ShowInTaskbar = false;
            base.OnLoad(e);
        }
    }
}