TabbedPage/CarouselPage With A Button

I need a TabbedPage, or CarouselPage with a save button underneath it. The user needs to be able to hit the save button regardless of which tab/page they are currently on. How do I achieve this?

I have been able to roughly achieve this with the CarouselView control (https://forums.xamarin.com/discussion/69120/carouselview-2-3-0-pre2#latest), but this is an unsupported control and does not work on Windows UWP.