Error: Array operations not implemented

[Sailormoontw]

Hello:

>From the converted DWT tutorial as follows:

  List list2 = new List(shell, DWT.SINGLE | DWT.BORDER);
  list2.setItems(["Rock","Paper","Scissors"]);
  list2.setBounds(110,0,50,50);
  list2.addMouseListener(new class MouseAdapter {
    public void mouseDown(MouseEvent e) {
      MessageBox.showMessage(list2.getSelection()[0] + " wins");
    }
    public void mouseUp(MouseEvent e) {
      MessageBox.showMessage("Try again!");
    }
  });

I got this message : 
testdwt.d(138): Error: Array operations not implemented

Note line 138 is the line
MessageBox.showMessage(list2.getSelection()[0] + " wins");

Thanks