Xamarin Native map point open infowindow by default - xamarin

Question

Im loading a native map application (android,IOS) with a custom pin location and with a custom marker.What i need is when i load the map i need to open the map pin marker info window by default.
currently what is happening is when user tap the pin info then only the pin info window shows up.
I have seen some code there markerOpt1.showInfoWindow() there is no method like this.
As per the documentation i know only one info window can pops up.In my scenario only one pin is there
Android implementation
public void OnMapReady(GoogleMap map)
{
MarkerOptions markerOpt1 = new MarkerOptions();
markerOpt1.SetPosition(new LatLng(50.379444, 2.773611));
markerOpt1.SetTitle("Vimy Ridge");
var bmDescriptor = BitmapDescriptorFactory.DefaultMarker (BitmapDescriptorFactory.HueCyan);
markerOpt1.InvokeIcon(bmDescriptor);
map.AddMarker(markerOpt1);
}
I have write custom renders for Android native application markers and ios mkmapview how can i show up the information view when loading the map

Answer 1

Here is the official sample of customrenderers-map-pin, to open infowindow by default,
In iOS:
protected override void OnElementChanged(ElementChangedEventArgs<View> e)
{
base.OnElementChanged(e);
//...
if (e.NewElement != null)
{
var formsMap = (CustomMap)e.NewElement;
var nativeMap = Control as MKMapView;
customPins = formsMap.CustomPins;
//...
//add MapLoaded Event
nativeMap.MapLoaded += NativeMap_MapLoaded;
}
}
And in NativeMap_MapLoaded:
private void NativeMap_MapLoaded(object sender, EventArgs e)
{
annotationView.SetSelected(true,true);
}
In Android, try this:
protected override void OnMapReady(GoogleMap map)
{
base.OnMapReady(map);
MarkerOptions markerOpt1 = new MarkerOptions();
markerOpt1.SetPosition(new LatLng(50.379444, 2.773611));
markerOpt1.SetTitle("Vimy Ridge");
var bmDescriptor = BitmapDescriptorFactory.DefaultMarker(BitmapDescriptorFactory.HueCyan);
Marker marker = map.AddMarker(markerOpt1);
marker.ShowInfoWindow();
}