Textview is not displaying on iphone but works fine on emulator

Hi i am trying to develop ios app using xamarin. i created the screen with one textview ( with some text), when i try to test it using emulator it works great. But when i try to test on iphone ( with ios 7.0.4), it does not display the textview on the screen, and also no error message is displayed. please help me on this asap.

Thanks,