title: IAP iOS UIAlertView cancel button
body: <p>I'm using StoreKit for implement purchacing in my app. My question is how can I hendle UIAlertView when IAP dialog appear. I need to process Cancel button. I need to know when I press cancel and notify my system about this. I need to process cancel button that on alert view that request my user and password data.</p>
  
  <p>For example if user tap on cancel button it should invoke some callback method.</p>