title: NSAttributedString in view-based NSOutlineView rendering as normal string?
body: <p>I'm trying to add some formatting to the cells in a view-based NSOutlineView. No matter what I try, the text is rendered without any format I specify. This is my current approach:</p>
  
  <pre><code>NSMutableAttributedString *versionString = [[NSMutableAttributedString alloc] 
                                               initWithString:myString];
  [versionString addAttribute:NSForegroundColorAttributeName 
                        value:[NSColor redColor] range:NSMakeRange(0, 3)];
  
  NSTableCellView result = [outlineView makeViewWithIdentifier:@"DataCell" 
                                                         owner:self];
  result.textField.allowsEditingTextAttributes = YES;
  result.textField.attributedStringValue = versionString;
  </code></pre>
  
  <p>Is it not possible to render attributed strings in a NSOutlineView and a standard NSTextField?</p>