title: NSUserNotification not showing action button
body: <p>I'm using this code:</p>
  
  <pre><code>- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
  {
      // Insert code here to initialize your application
      NSUserNotification *notification = [[NSUserNotification alloc] init];
      [notification setTitle: @"Title"];
      [notification setSubtitle: @"Subtitle"];
      [notification setInformativeText: @"Informative Text"];
  
      [notification setHasActionButton: YES];
      [notification setActionButtonTitle: @"Action Button"];
      [notification setOtherButtonTitle: @"Other Button"];
  
      [notification setSoundName: NSUserNotificationDefaultSoundName];
  
      [notification setDeliveryDate: [NSDate dateWithTimeIntervalSinceNow: 10]];
      [[NSUserNotificationCenter defaultUserNotificationCenter] scheduleNotification: notification];
  }
  </code></pre>
  
  <p>And I'm getting, without fail,</p>
  
  <p><img src="https://i.stack.imgur.com/5gLh3.png" alt="enter image description here"></p>
  
  <p>No action button, or other button.</p>