UIModalPresentationFormSheet cannot change supervisor background to clear

Question

I use a UIViewController with a presentation style of UIModalPresentationFormSheet , then I try to present this modal controller with another with the current context and Flip Horizontal transition style. But the results look like in the application ...

I am trying to set superview.backgroundColor = [UIColor clearColor]; but any results ... also i am trying to change the background color of superview.layer but have effect