title: How to customize UIAlertView
body: <p>I have <code>UIAlertView</code> which holds an <code>UIImage</code> and two default buttons <code>OK</code> and <code>Cancel</code>.</p>
  
  <p>Now i want to customize <code>UIAlertView's</code> background color to white color, and need to add my Image and two default buttons. </p>