title: UIAlertView button tagging
body: <p>Is there a way I can add a .tag to an UIAlertView button? Reason being, I'm adding a few dynamic buttons to the alert that will sometimes be in the alert and sometimes not. I figured the best way was to add a tag. Is there a better method for this?</p>
  
  <p>The options that will ALWAYS be in the alert are Email, Save. And the 2 optional options are Tweet This and Facebook.</p>
  
  <p>Thanks for any help in advance!</p>