private async Task Save()
        {
            while (App.Storage.Exist(NewEvent.Guid))
            {
                NewEvent.Guid = Guid.NewGuid();
            }

            if (_icon_file != null)
            {
                NewEvent.IconPath = await StoreFile("Icons", _icon_file);
            }
            else
            {
                NewEvent.IconPath = new Uri("ms-appx:///Assets/item.png");
            }
            if (rbtnVideo.IsChecked.Value)
            {
                NewEvent.MediaMessageType = MediaMessageType.Video;
                NewEvent.MediaMessageUri  = await StoreFile("Videos", _video_file);
            }
            else if (rbtnAudio.IsChecked.Value)
            {
                NewEvent.MediaMessageType = MediaMessageType.Voice;
                NewEvent.MediaMessageUri  = await StoreFile("Audios", _audio_file);
            }

            if (ink.InkPresenter.StrokeContainer.GetStrokes().Count > 0)
            {
                NewEvent.HasStroke = true;
                StorageFile file = await(await ApplicationData.Current.LocalFolder.
                                         CreateFolderAsync("Inks", CreationCollisionOption.OpenIfExists)).CreateFileAsync(NewEvent.Guid.ToString() + ".gif");
                using (IRandomAccessStream stream = await file.OpenAsync(FileAccessMode.ReadWrite))
                {
                    using (IOutputStream outStream = stream.GetOutputStreamAt(0))
                    {
                        await ink.InkPresenter.StrokeContainer.SaveAsync(outStream);

                        await outStream.FlushAsync();
                    }
                }
            }

            if (tglNotify.IsOn)
            {
                if (alarmOffset == null)
                {
                    alarmOffset = NewEvent.Date.Date + timePicker.Time;
                }
                var xml = App.FormNotification(NewEvent.Name, string.IsNullOrWhiteSpace(NewEvent.Message) ? "" : NewEvent.Message,
                                               NewEvent.IconPath.AbsoluteUri, NewEvent.Guid.ToString());
                ScheduledToastNotification notification = new ScheduledToastNotification(xml, alarmOffset.Value);
                ToastNotificationManager.CreateToastNotifier().AddToSchedule(notification);
                NewEvent.Alarm = alarmOffset.Value;
            }
            await NewEvent.SaveToFileAsync();

            App.Storage.AddEvent(NewEvent);
            if (NewEvent.IsPast)
            {
                App.State.MenuSelected = MenuSelection.Past;
            }
            else
            {
                App.State.MenuSelected = MenuSelection.Scheduled;
            }
            App.State.Year       = NewEvent.Date.Year;
            App.State.Month      = NewEvent.Date.Month;
            App.State.ActivePage = PageActive.Events;
            App.MenuRefresh();
            App.Cont.Content = App.GetActivePage(NewEvent);
        }