Disable Radio button

[AJG]

when the user presses on the A radio button i want radio buttons B,C and D to be disabled i used the code:

Code:

        A.addActionListener(new  ActionListener()
        {
            public void actionPerformed(ActionEvent e)
            {
                B.setEnabled(false);
                C.setEnabled(false);
                D.setEnabled(false);
                answerwrong ++;
            }
        });

however this isnt working any ideas on how i can get these button to disable