Step 1: Get Google Play Services component from Component Store
Step 2: Implement GoogleMap.IInfoWindowAdapter
using Android.Gms.Maps;
using Android.Gms.Maps.Model;
using Android.Views;
public class InfoWindow : Java.Lang.Object, GoogleMap.IInfoWindowAdapter
{
#region IInfoWindowAdapter implementation
public View GetInfoContents(Marker p0)
{
throw new NotImplementedException ();
}
public View GetInfoWindow(Marker p0)
{
throw new NotImplementedException ();
}
#endregion
}