UIDesignRequiresCompatibility
A Boolean value that indicates whether the system runs the app using a compatibility mode for UI.
Discussion
If YES, the system runs the app using a compatibility mode for UI elements. The compatibility mode displays the app as it looks when built against previous versions of the SDKs.
If NO, the system uses the UI design of the running OS, with no compatibility mode. Absence of the key, or NO, is the default value for apps linking against the latest SDKs.