Best practice ============= Structure --------- We are in transation from an old to a new API. Old code use captial letters "GO.*" namespaces. New code uses small letters "go.*". The new API can be found in the following folders: - go/modules///views/extjs3/* - go/core/views/extjs3/* Extending --------- When extending components with Ext.extend() always override initComponent and not the constructor:: go.modules.pkg.mymodule.MyComp = Ext.extend(Ext.Panel, { initComponent: function() { go.modules.pkg.mymodule.MyComp.superclass.initComponent.call(this); //Do your initialization here } }); Core overrides are put in views/Extjs3/javascript/overrides.js