protected override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
webBrowser.Navigating -= webBrowser_Navigating;
_locationManager.OnPositionDetermined -= _locationManager_OnPositionDetermined;
_locationManager = null;
base.OnNavigatingFrom(e);
}
protected override void OnNavigatedTo(NavigationEventArgs e)
{
webBrowser.Navigating += webBrowser_Navigating;
this.LayoutUpdated += InitialPage_LayoutUpdated;
_locationManager = new LocationManager();
_locationManager.OnPositionDetermined += _locationManager_OnPositionDetermined;
base.OnNavigatedTo(e);
}