How to make label open url

Hi Xamarin Forum

may I ask how to open an external url by tapping on a Label here is my xaml code and codebehind

void OpenGoogleMap(object sender, EventArgs args)
{
Device.OpenUri(new Uri("http://www.google.com"));
}

     <Label Text="Tap Here to open Google Map">
                   <Label.GestureRecognizers>
                        <TapGestureRecognizer Tapped="OpenGoogleMap"/>
                </Label.GestureRecognizers>

am I missing something because it does not react to my tap