title: osx Add inputs to NSAlert
body: <p>I would like to use a NSAlert in my OSX application to deal with user authentication.</p>
  
  <p>The answer to this question <a href="https://stackoverflow.com/questions/7905197/pop-up-style-dialog">pop up style dialog</a> covers the basics but I can't figure out how to expand a accessoryView to include two inputs and a label for each.</p>
  
  <p>This produces a single text input:</p>
  
  <pre><code>NSAlert *myAlertView = [[NSAlert alloc]init];
  
  NSTextField *input = [[NSTextField alloc] initWithFrame:NSMakeRect(0, 0, 200, 24)];
  [input setStringValue:@""];
  [myAlert setAccessoryView:input];
  </code></pre>
  
  <p>Any suggestions would be greatly appreciated.  </p>