title: NSSavePanel's AccessoryView sometimes disabled
body: <p>I tried to add a AccessoryView to a NSSavePanel but sometimes the AccessoryView (it's elements) is disables and sometimes not. Hopefully anyone has a idea.</p>
  
  <p>Here is my code:</p>
  
  <pre><code>    NSWindow *window = [[NSApp delegate] window];
  
  // Get savePath
  NSSavePanel *spanel = [NSSavePanel savePanel];
  
  __block SaveAccessoryViewController *saveAccessoryViewController = [[SaveAccessoryViewController alloc] initWithNibName:@"SaveAccessoryView" bundle:nil];
  
  [spanel setAllowedFileTypes:[NSArray arrayWithObject:@"pdf"]];
  [spanel setAccessoryView:saveAccessoryViewController.view];
  
  [spanel beginSheetModalForWindow:window completionHandler:^(NSInteger returnCode) {
  ...
  </code></pre>