Adding Email in-app dialog to OpenGL App

I encountered a problem when trying to follow this tutorial about adding in-app Email dialog. I had a general problem. I didn't have a UIViewController. I only had MyEAGLView instance, a UIView

After reading this article about UIViewController, it clicked.

All I had to do was create a UIViewController in the appFinishedLoading and then I added the opengl view to the viewcontroller. Then made the view of the view controller as a subview of the window.

 viewController = [[UIViewController alloc] init];
 [viewController.view addSubview:glView];
 
 [window addSubview:viewController.view];