Frame context menu and mouse listener

[Leon]

I like to remove a context menu from Frame and add some mouse listener into 
Frame. I try the following code and it doesn't work:

frame.addHandler(new MouseDownHandler() {
            
            @Override
            public void onMouseDown(MouseDownEvent event) {
                Element relativeElement = event.getRelativeElement();
                System.out.println(relativeElement);
            }
        }, MouseDownEvent.getType());
        
        frame.addDomHandler(new ContextMenuHandler() {
            
            @Override public void onContextMenu(ContextMenuEvent event) {
                event.preventDefault();
                event.stopPropagation();
            }
        }, ContextMenuEvent.getType());

Thanks.

Leon

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