iOS Table View Cell Separator Lines Not Showing

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *mbTableIdentifier = @"SimpleTableItem";
    UIImageView *image = [[UIImageView alloc]init];
    image.image = [UIImage imageNamed:@"BarButton.png"];

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:mbTableIdentifier];

    if (cell == nil)
    {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:mbTableIdentifier];
        cell.textLabel.font=[UIFont systemFontOfSize:16.0];
    }

    // cell.backgroundView = [[CustomCellBackground alloc] init];
    cell.selectedBackgroundView = [[CustomCellBackground alloc] init];
    cell.textLabel.backgroundColor = [UIColor clearColor];
    cell.textLabel.highlightedTextColor = [UIColor darkGrayColor];
    cell.textLabel.textColor = [UIColor whiteColor];
    cell.backgroundView = image;

    cell.textLabel.text = [mbTableData objectAtIndex:indexPath.row];
    return cell;
}

cell.backgroundView = [[CustomCellBackground alloc] init];

cell.backgroundView = image;