protected override void OnDisplay(NavigationEvent evt)
{
// Get all the state from the service, rather than directly from the event.
View.WelcomeText = _applicationData.GetIntroductionText();
// Register the view handlers to presenter methods.
View.WelcomeOk += WelcomeViewOnWelcomeOk;
View.CloseRequest += WelcomeViewCloseClicked;
View.Show();
}