Problem getting GridView (Xamarin Labs) to show up

Hey everyone - thanks in advance. First post here....so far loving Xamarin Forms.

I'm using the GridView control from Xamarin Labs (https://github.com/XForms/Xamarin-Forms-Labs/tree/master/src/Xamarin.Forms.Labs/Xamarin.Forms.Labs.iOS/Controls/GridView)

I can display a ListView fine, but when I bind to the GridView it compiles and runs but doesn't display. Is there anything I need to do differently with GridView vs ListView?

Can it use a ViewCell just like ListView does?