private async void Initial()
{
await App.Configuration.InitialAsync(this);
NavigationPage.SetHasNavigationBar(this, false);
_model = new WelcomeViewModel();
_model.SetActivityResource(false, true, false, false, TextResources.ValidatingCredentials, string.Empty,
string.Empty);
BindingContext = _model;
_backButtonPress = DependencyService.Get <IBackButtonPress>();
await _model.OnLoad();
}
