add: e.setPropagationStopped(true); 
context: proto._onmousedown = function(e) {  this.setState(this.getState() == "pressed" ? "hover" : "pressed");};
meta: 1005	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/1005/07b287bf8c2bfdad7c2098414db881facf7a06cb/QxMenuBarButton.js/clean/qooxdoo/source/script/widgets/QxMenuBarButton.js