add: if (!this._enabled) return; 
context:     _mainMenuMouseDown: function(event) {        var overItem = tw_getEventTarget(event, "menuItem");                if (overItem == null) {            var item = tw_getEventTarget(event, "mainMenuItem");                this.close(item);            this._menusAreVisible = this._menusAreVisible ? false : true;            this._setHighlight(item, true);            if (this._menusAreVisible) this._open(item);        }    },
meta: 5515	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/5515/37796fea05d0eb86951d2f34aedeb66e8b500920/Menu.js/buggy/src/thinwire/render/web/resources/Menu.js