@Override
    public HandlerRegistration addCloseHandler(CloseHandler<PopupPanel> handler) {

        m_closeHandler = handler;
        m_handlerReg = super.addCloseHandler(handler);
        return m_handlerReg;
    }
@ Override public HandlerRegistration addCloseHandler ( CloseHandler < PopupPanel > handler ) { m_closeHandler = handler ; m_handlerReg = super . addCloseHandler ( handler ) ; return m_handlerReg ; }
@see org.opencms.gwt.client.ui.CmsPopup#addCloseHandler(com.google.gwt.event.logical.shared.CloseHandler)