Printing on iOS with UIPrintInteractionController

I tried to print with the UIPrintInteractionControlleron iOS, however the popover is not showing up when i call PresentFromRectInViewAsync. The screen gets dark and i can also dismiss the ( not visible ) popover by just clicking somewhere on the screen.

This is basically what i did:
controller.PresentFromRectInViewAsync(Helper.GetTopView().Frame, Helper.GetTopView(), false);

Where Helper.GetTopView() is:

UIViewController controller = UIApplication.SharedApplication.KeyWindow.RootViewController;
while (controller.PresentedViewController != null)
{
    controller = controller.PresentedViewController;
}
return controller.View;

Anyone tried this before?