Close window confirmation dialog

When the user presses the X button at the top-right corner of the main frame I want him to confirm that he intends to close that frame.
So using windowClosing(WindowEvent e) and windowClosed(WindowEvent e) I display a confirmation dialog (JOptionPane) - the problem is that even when he chooses "No" the frame is being closed.
Doing the same from File->Exit menu works just fine obviously.
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savalouConnect With a Mentor Commented:
Have you tried to consume() the event?  

Here's some info on an alternate approach:
The following combo will do the trick:

addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
            int returnValue = JOptionPane.showConfirmDialog(null, "Are you sure you want to close?");
            if (returnValue == JOptionPane.YES_OPTION) {
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