title: iOS Transparent ViewController
body: <p>I'm trying to create a transparent modal ViewController, which overlays the current ViewController. I set the backgroundcolor to clearcolor but the background is black,
  because the other viewcontroller is not shown behind the new viewcontroller. I want a overlay like a UIAlertView.</p>
  
  <p>I googeled a lot, and the only solution i found was to add a subview.
  I'm using iOS5.</p>