private void initEventPreviewHandler() {

        m_previewHandlerRegistration = Event.addNativePreviewHandler(new NativePreviewHandler() {

            public void onPreviewNativeEvent(NativePreviewEvent event) {

                previewNativeEvent(event);
            }
        });
    }
private void initEventPreviewHandler ( ) { m_previewHandlerRegistration = Event . addNativePreviewHandler ( new NativePreviewHandler ( ) { public void onPreviewNativeEvent ( NativePreviewEvent event ) { previewNativeEvent ( event ) ; } } ) ; }
Initializes the event preview handler.<p>