private async void LoadNewDraft()
        {
            if (currentUserId == null)
            {
                return;
            }

            var userId = currentUserId.Value;

            // Load data:
            var draftModel = await TimeEntryModel.GetDraftAsync();

            // Check that the user hasn't changed in the mean time
            if (userId != currentUserId)
            {
                return;
            }

            // Update data
            if (draftModel != null)
            {
                var draftData = draftModel.Data;
                if (!draftEntries.UpdateData(draftData))
                {
                    draftEntries.Add(draftData);
                }
            }

            UpdateProperties();
        }
        private async void LoadTimeEntries()
        {
            if (currentUserId == null)
            {
                return;
            }

            var userId = currentUserId.Value;
            var store  = ServiceContainer.Resolve <IDataStore> ();

            // Load data:
            var draftTask   = TimeEntryModel.GetDraftAsync();
            var runningTask = store.Table <TimeEntryData> ()
                              .QueryAsync(r => r.State == TimeEntryState.Running && r.DeletedAt == null && r.UserId == userId);

            await Task.WhenAll(draftTask, runningTask);

            // Check that the user hasn't changed in the mean time
            if (userId != currentUserId)
            {
                return;
            }

            // Update data
            var draftModel = draftTask.Result;

            if (draftModel != null)
            {
                var draftData = draftModel.Data;
                if (!draftEntries.UpdateData(draftData))
                {
                    draftEntries.Add(draftData);
                }
            }

            foreach (var entry in runningTask.Result)
            {
                if (!runningEntries.UpdateData(entry))
                {
                    runningEntries.Add(entry);
                }
            }

            UpdateProperties();
            TryEnforceSingleRunning();
        }