Java Programming

Hi All

I've got a JInternalFrame (intFrame) with this:-

intFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

I've added a: - intFrame.addInternalFrameListener(this);

Within 'this' I've got: -

public void internalFrameClosing(InternalFrameEvent e) {
        	int i = JOptionPane.showInternalConfirmDialog(intFrame,
"Do you really wish to Close?", 
"Message", 
JOptionPane.YES_NO_OPTION,
JOptionPane.INFORMATION_MESSAGE);
		
//The user must decide weather or not to dispose the JInternalFrame
if( i == JOptionPane.NO_OPTION )
         listenedToWindow.show();   //An effort to prevent it from closing
    }

This does not work. I cannot prevent the JInternalFrame from closing.
I tried overwriting the dispose() method but an exception is thrown saying that intFrame is an invalid parent for JOptionPane.showInternalConfirmDialog(....)
Therefore I conclude that setting the default close operation to dispose does not simply cause a call to method dispose() when the close icon is pressed on the JInternalFrame as I expected.

My Question is this. How can I prevent the JInternalFrame from closing. I wish it to dispose not hide when the user decides to actually close it.

Thanks.