protected virtual void SetupMapView(IBindableMapView mapView)
 {
 }
 protected virtual void BindMapView(IBindableMapView mapView, MvxFluentBindingDescriptionSet <PointsMapViewController, IPointsMapViewModel> set)
 {
     set.Bind(mapView).For(s => s.Items).To(vm => vm.Items);
     set.Bind(mapView).For(s => s.SelectedItem).To(vm => vm.SelectedItem);
     set.Bind(mapView).For(s => s.SelectionChangedCommand).To(vm => vm.SelectionChangedCommand);
 }