public MainWindow()
     : base(Gtk.WindowType.Toplevel)
 {
     Build ();
     _ma = new MaxAddition();
     entry1.SetValueReference(delegate(string value){_ma.FirstStringInteger = value;}, delegate(){return _ma.FirstStringInteger;}, "FirstStringInteger");
     entry2.SetValueReference(delegate(string value){_ma.SecondStringInteger = value;}, delegate(){return _ma.SecondStringInteger;}, "SecondStringInteger");
     entry3.SetValueReference(delegate(string value){}, delegate(){return _ma.ResultString();}, "Result");
     _ma.ObjectValidated += ValidationHandler;
 }
 public void SetUp()
 {
     _maxAddition = new MaxAddition();
 }