private void OnRefresh()
 {
     PersonList = new ObservableCollection <Person>(_repo.GetAllPersons());
     Messenger.Default.Send(new UpdateMergeButtonMessage());
 }
 public PersonListViewModel(ITextRepository repo)
 {
     _repo          = repo;
     PersonList     = new ObservableCollection <Person>(_repo.GetAllPersons());
     RefreshCommand = new RelayCommand(OnRefresh);
 }