private void callPeople(object sender, MouseEventArgs e)
 {
     backUrl.Add(starship.url);
     this.Content = PeopleViewModel.CallPeople(sender, e, listCharacters, backUrl);
 }
 private void callPeople(object sender, MouseEventArgs e)
 {
     backUrl.Add(species.url);
     this.Content = PeopleViewModel.CallPeople(sender, e, listPeople, backUrl);
 }