code: private void initializeButtons()
  	{
  		initializeButton(button1 = new Button("1"), Color.black, Color.lightGray);
  		initializeButton(button2 = new Button("2"), Color.black, Color.lightGray);
  		initializeButton(button3 = new Button("3"), Color.black, Color.lightGray);
  		initializeButton(button4 = new Button("4"), Color.black, Color.lightGray);
  		initializeButton(button5 = new Button("5"), Color.black, Color.lightGray);
  		initializeButton(button6 = new Button("6"), Color.black, Color.lightGray);
  		initializeButton(button7 = new Button("7"), Color.black, Color.lightGray);
  		initializeButton(button8 = new Button("8"), Color.black, Color.lightGray);
  		initializeButton(button9 = new Button("9"), Color.black, Color.lightGray);
  		initializeButton(button0 = new Button("0"), Color.black, Color.lightGray);
  		initializeButton(buttonCancel = new Button("A"), Color.black, Color.lightGray);
  		initializeButton(buttonTable = new Button("T"), Color.black, Color.lightGray);
  		initializeButton(buttonEnter = new Button("E"), Color.black, Color.lightGray);
  		initializeButton(buttonMinus = new Button("-"), Color.black, Color.lightGray);
  		initializeButton(buttonPlus = new Button("+"), Color.black, Color.lightGray);
  		initializeButton(buttonStorno = new Button("ST"), Color.black, Color.lightGray);
  	}
docs: Initialize the buttons.