title: App Store login popup. Input doesn't work
body: <p>I'm writing an app in which I can buy some stuff per InAppPurchases. The requests work fine, I am getting the right infos from Apple Stores but when it comes to buying an error occurs. When I send a request with a payment to do I am getting a popup window from Apple with a request to Sign in. I click 'Use Existing Apple ID' and another popup shows up where I can actually put my AppleID.</p>
  
  <p>The problem is I cannot write anything into those TextFields (neither username nor password). The focus works fine, I can click both of them and they have the cursor blinking.</p>
  
  <p>I have also two TextFields on my ViewController and they are not disabled even when Apple Popup is visible and the rest is darkened.</p>
  
  <p>I'm working on iOS Simulator with iOS 8.0 on it and with XCode 6 - beta5.</p>
  
  <p>How can I solve this issue? Maybe a delegate would be helpful, but I can get no ID or something for Apple-generated-windows.</p>