private void SendSettingsChangedMessage(string key)
 {
     var msg = new SettingsChangedMessage() { Key = key };
     Messenger.Default.Send<SettingsChangedMessage>(msg);
 }
 private void ReceiveMessage(SettingsChangedMessage msg)
 {
     var key = msg.Key;
     if (key.Equals("Unit"))
     {
         MetricSetting = App.AppSettings.MetricSetting;
     }
     if (key.Equals("LocationService"))
     {
         LocationServiceSetting = App.AppSettings.LocationServiceSetting;
     }
 }