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Camera Locking in AutoRotate

I'm using Vuforia sample app and i replaced SampleAppaboutViewController with my own viewcontroller then i used UIButton text etc in ImageTargetsEAGLView. But when i rotate the app the from landscape to portrait or portrait ot Landscape the camera loocking. I change the code in SampleApplciationSeesion with what code has in Books. I'm using iPadMini iOS 6.1