title: UITableViewCell is transparent when not supposed to be
body: <p>My UITableViewCell is being transparent when it's not supposed to be. My table view has a background color and it shows through the table cell, even though they're supposed to be opaque. I'm not sure why this is.</p>
  
  <p>Relevant code:</p>
  
  <pre><code>    UITableViewCell *cell = [table dequeueReusableCellWithIdentifier:emptyIdentifier];
      if (cell == nil) {
          cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:emptyIdentifier] autorelease];
      }
  
      cell.textLabel.text = @"Empty";
      cell.textLabel.textAlignment = UITextAlignmentCenter;
      cell.textLabel.backgroundColor = [UIColor whiteColor];
      return cell;
  </code></pre>