private void createField()
 {
     for (int buttonNumber = 0; buttonNumber < NumberOfButtons; ++buttonNumber)
       {
     ButtonController button = new ButtonController();
     model.addButton(button);
       }
 }
 internal void addButton(ButtonController button)
 {
     buttons.Add(button);
 }
 public ButtonView(ButtonController buttonController)
 {
     InitializeComponent();
       controller = buttonController;
 }