title: Change background of a grouped UITableView
body: <p>I'm having some trouble trying to change the background of a UITableView with groups.</p>
  
  <pre><code>_tableView.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"tableViewBg.png"]];
  </code></pre>
  
  <p>This usually works on every other UITableView, but not the one with groups, is there something else I have to do?
  In IB I have the background color set to a clear color, but that doesn't do much.</p>