[OpenMap Users] popup a confirm dialog when user close application

This is how I use OpenMap

public class SCSeaWatch {
        public SCSeaWatch() {
                MapHandler mapHandler = new MapHandler();
                omFrame = new OpenMapFrame(p.getProperty("WINDOW_NAME"));
                mapHandler.add(omFrame);
                mapBean = new MapBean();
                mapBean.setBorder(new BevelBorder(BevelBorder.LOWERED));
                mapHandler.add(mapBean);
                ...
        }
...
}

Which work fine, however I don't want the application to quit right away
when user click on the close (cross button). How can I achive this ? I try a
naughty way to edit the code of OpenMapFrame to insert a confirm dialog when
user click on "close", it bring up the confirm dialog, however if I choose
"No", the application still run (I see the process still run) but the window
disappear, so oviously there are code else where for the WindowEvent

Please help,

thanks

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