public static void ShowDesignOverlay(
            TimelineStyle testStyle = null)
        {
            if (designOverlay == null)
            {
                dummyNoticeList = TimelineVisualNoticeModel.CreateDummyNotices(testStyle);

                designOverlay = CreateDesignOverlay();
            }

            designOverlay.Show();
            designOverlay.OverlayVisible = true;

            foreach (var notice in dummyNoticeList)
            {
                designOverlay.AddNotice(notice, true);
            }
        }