How do I set ContentPage.BackgroundImage NOT to be tiled?

I am using Xamarin.Forms and I can set the ContentPage's background image to an image and it does display. However, it is displayed tiled - my image is smaller than the ContentPage so multiple tiled instances of it fills up the background. Is there a way/setting that I can use to display the background image (just one instance) centered in the ContentPage? Thanks!