public void StartMonitoring(GeofenceRegion region)
{
//if !CLLocationManager.isMonitoringAvailableForClass(CLCircularRegion) {
UIApplication.SharedApplication.InvokeOnMainThread(() =>
{
var native = this.ToNative(region);
this.locationManager.StartMonitoring(native);
});
//this.locationManager.DesiredAccuracy
//this.locationManager.StartMonitoring(native, this.DesiredAccuracy.TotalMeters);
}