public PeopleSelectorWindow (PersonEventHandler handler, Gtk.Window parent) : base(Gtk.WindowType.Toplevel)
 {
     this.Build ();
     this.TransientFor = parent;
     this.Modal = true;
     this.OnSelect = handler;
     this.ActivateFocus ();
 }
 public int Add(Person newPerson)
 {
     personList.Add(newPerson);
     PersonEventHandler?.Invoke(this, new PersonEventArgs(newPerson));
     return(personList.Count);
 }