// Important for being sure all view controllers are allocated and initialized
   for(UIViewController * viewController in  [self viewControllers]) {
       [viewController view];
   }

- (DataTableViewContentCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *contentCell = @"ContentCell";
    DataTableViewContentCell *cell = [tableView dequeueReusableCellWithIdentifier:contentCell];

    if (!cell)
    {
        cell = [[DataTableViewContentCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:contentCell];
    }

    NSDictionary *dictionary = data[[indexPath section]];
    NSArray *array = dictionary[@"contents"];
    NSString *contentName = array[[indexPath row]];

    [[cell contentNameLabel] setText:contentName];

    return cell;
}

# pragma mark - UI update

- (void)updateEntryCountWithIndexPathSection:(NSInteger)indexSection
                                          Row:(NSInteger)indexRow
                                   EntryCount:(NSInteger)entryCount
{
    NSIndexPath *indexPath = [NSIndexPath indexPathForRow:indexRow inSection:indexSection];
    DataTableViewContentCell* cell = (DataTableViewContentCell*) [[self dataTableView] cellForRowAtIndexPath:indexPath];
    [[cell entryNumberLabel] setText:[NSString stringWithFormat:@"%d", entryCount]];
    NSLog(@"%@",[[cell contentNameLabel] text]); // Initially visible cells return correct name, the others return null
}