title: UIButton added into content view of UITableViewCell only appears when cell is selected
body: <p>I'm having problems trying to add buttons into a UITableViewCell's content view.
  The button cannot be seen. But, when I click on the cell and when it is selected (with the default bluebackground), the button can be seen.</p>
  
  <p>The table view controller is created with: <code>initWithStyle:UITableViewStyleGrouped</code>.                  </p>
  
  <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {
      static NSString *CellIdentifier = @"Cell";
      UIButton *theButton;
  
  
  UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
      if (cell == nil) {
          cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] autorelease];
  
      theButton = [[UIButton alloc] initWithFrame:CGRectMake(800, 25, 32, 32)];
      [cell.contentView addSubview:theButton];
      theButton.tag = 1;
      [theButton release];
  
  }
  
  if(indexPath.section ==0){
          //...logic...
      }else if(indexPath.section ==1){
          //...logic...
      }else{
          cell.textLabel.text = @"some string";
  
     theButton = (UIButton*)[cell.contentView viewWithTag:1];
      [theButton setImage:theImage forState:UIControlStateNormal];
  }
  
  return cell;
  }
  </code></pre>