Java MouseListener for ComboBox

How do I add a MouseListener to a ComboBox? I have tried:

c开发者_运维问答omboBox.addMouseListener(new MouseAdapter() { 
    public void mousePressed(MouseEvent event) {
        System.out.println("ok");   
    }

    public void mouseReleased(MouseEvent event) {
        System.out.println("ok");   
    }
});

It doesn't seems to work. I need to make the program do something when I press on the ComboBox, for example for typing because it is editable.

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For basic swing related questions (I assume you use swing here), check the swing trail of the Java tutorial.