I'd like to generate some revenue for my OpenGL based iPhone app w/ Apple's iAds. Everything in the app is done w/ OpenGL including menus, buttons etc. **How do I add iAds to my app?**

**More info**: I've looked over sample code from Apple and I'm still stuck. Just fyi I currently don't use any view controllers. All I have is a "Window". I tried adding the bannerView to the window with the addSubView method but it just crashes the app. For some reason this works fine with the MailComposerView. Any help is appreciated!

**More info**: I created a subclass of UIViewController and put a BannerAd on it. Now the test advertisements show up. **How do I make the rest of the UIView transparent such that the ads show up (with an alpha of 1.0) and I can also click on my buttons being created w/ OpenGL on the window below the UIViewController**?