Putting BeginInvokeOnMainThread() back the way Xamarin had it
Putting BeginInvokeOnMainThread() back the way Xamarin had it

This reverts commit c6853d52c478585126d6d6f4f69ec9d021c7489f.

Hitcents/Xamarin.Forms,Hitcents/Xamarin.Forms,Hitcents/Xamarin.Forms