void Handle_IndexChanged(object sender, System.EventArgs e)
{
var selector = (Picker)sender;
int touchIndex = selector.SelectedIndex;
City_Map.MoveToRegion(MapSpan.FromCenterAndRadius(new Position(MyList.latitude[touchIndex], MyList.longitude[touchIndex]), Distance.FromMiles(2)));
}
public CitiesMap(ListClass listclass)
{
InitializeComponent();
BindingContext = listclass;
MyList = listclass;
var initialMapLocation = MapSpan.FromCenterAndRadius(new Position(MyList.latitude[0], MyList.longitude[0]), Distance.FromMiles(50));
City_Map.MoveToRegion(initialMapLocation);
PlaceAMarker();
Picker();
}