my user control's event not listed on "properties window"

Question

hi. i'm creating a user control with vs2008 (c#), it works well but the events are not listed on the properties window, the "little thunder icon" is not even displayed on the toolbar. WHY???

My event def

    [Browsable(true)]
    public event ImageClickEventHandler DeleteButtonClick
    {
        add { IbDelete.Click += value; }
        remove { IbDelete.Click -= value; }
    }