public async Task LoadSessions()
        {
            IsBusy = true;

            try
            {
                await syncService.SyncIfNecessary(CancellationToken.None).ConfigureAwait(false);

                var sessions = await conferenceStore.GetSessions().ConfigureAwait(false);

                sessions = sessions.Where(s => s.IsFavorite);

                SessionsGrouped = sessions.GroupByStartTime();
            }
            finally
            {
                IsBusy = false;
            }
        }
        public async Task LoadSessionsInternal()
        {
            Sessions = await conferenceStore.GetSessions().ConfigureAwait(false);

            SessionsGrouped = sessions.GroupByStartTime();
        }