async Task Login()
{
IsBusy = true;
PropChangedCallBack();
var authToken = await firebaseAuthenticator.LoginWithEmailPassword(Email.Value, Password.Value);
if (string.IsNullOrEmpty(authToken) == false)
{
(Application.Current as App).AuthToken = authToken;
await navigationService.PushAsync(new TourGuidePage());
}
else
{
UserExists = false;
}
IsBusy = false;
PropChangedCallBack();
}
