protected override void OnActivate(CancelEventArgs e)
        {
            if (IsActivated == false)
            {
                var service = Site != null?Site.GetService(typeof(SIndentGuide)) as IndentGuideService : null;

                if (service != null)
                {
                    service.PreserveSettings();
                }
                IsActivated = true;
                ShouldSave  = false;
            }
            base.OnActivate(e);
            Wrapper.Activate();
        }