Apps initialized with a storyboard don't get a main window

[bviglietta]

Applications that are initialized with a storyboard are supposed to have a main UIWindow automatically created, and the app delegate's "window" property should be initialized with this value. However, this window is never created in WinObjC apps.

The only window that gets created is the popup window, which is also, as a result of being the only window in existence, erroneously marked as the key window.

See the XAMLCatalog sample app for an example of this behavior.