C#

protected override System.Windows.Forms.CreateParams CreaeParams
{
  get
  {
    System.Windows.Forms.CreateParams cp = base.CreateParams;
    cp.Style |= WS_HSCROLL | WS_VSCROLL;
    return cp;
  }
}
const int WS_HSCROLL = 0x00100000;
const int WS_VSCROLL = 0x00200000;

class OpenPortMenuItem : MenuItem
{
    public delegate void OpenPortEventHandler(object o, OpenPortEventArgs e);
    public event OpenPortEventHandler PortClick;

    public OpenPortMenuItem()
    {
        this.PortClick += new OpenPortEventHandler(OnPortClick);
    }

    protected override void OnClick(EventArgs e)
    {
        if(PortClick != null)
        {
            OpenPortEventArgs args = new OpenPortEventArgs();
            args.Port = 80; //default value
            PortClick(this, args);
        }
    }

    protected void OnPortClick(object sender, OpenPortEventArgs e)
    {
        base.OnClick(e);
    }
}
     class OpenPortEventArgs : EventArgs
{
    private int _port;
    public int Port
    {
        get{return _port;}
        set{_port = value;}
    }

    public OpenPortEventArgs(){}
}



    // using it somewhere...
    OpenPortMenuItem m = new OpenPortMenuItem();
    OpenPortMenuItem m2 = new OpenPortMenuItem();
    m.Click += new EventHandler(this.COM_Click);
    m2.Click += new EventHandler(this.COM_Click);
    this.mainMenu1.MenuItems.AddRange(new OpenPortMenuItem[] {m, m2});
    // more...
    private void COM_Click(object sender, OpenPortEventArgs e)
    {
        // Get the menu item.
        MenuItem m = sender as MenuItem;
        if(m != null)
        {
            // use m here.....
        }
        OpenPortEventArgs a = e as OpenPortEventArgs;
    if(a != null)
        {
            // use a here...
        }
     }