title: How to change a UIAlertView's button background color?
body: <p>I've created <code>UIAlertView</code> with multiple buttons with the following code:</p>
  
  <pre><code>UIAlertView *alert = [[UIAlertView alloc] initWithFrame:CGRectMake(0, 0, 300, 200)];
  alert.tag = TAG_ALERT0;
  alert.title = @"Notes";
  alert.delegate = self;
  [alert addButtonWithTitle:@"Add Note"];
  [alert addButtonWithTitle:@"Show Notes"];
  [alert addButtonWithTitle:@"Cancel"];
  [alert show];
  </code></pre>
  
  <p>I'm wondering if it is possible to add a different background color to each button?</p>