Наследование от Ext.Ajax нельзя делать?
При попытке наследоваться возникает ошибка:
Uncaught TypeError: Cannot read property 'defaultConfig' of undefined
at Function.<anonymous> (ext-all-rtl-debug.js?_dc=1485867203820:13398)
at Function.doProcess (ext-all-rtl-debug.js?_dc=1485867203820:13236)
at ext-all-rtl-debug.js?_dc=1485867203820:19882
at Object.load (ext-all-rtl-debug.js?_dc=1485867203820:19390)
at Object.require (ext-all-rtl-debug.js?_dc=1485867203820:19323)
at Object.require (ext-all-rtl-debug.js?_dc=1485867203820:14165)
at Function.<anonymous> (ext-all-rtl-debug.js?_dc=1485867203820:19856)
at Function.doProcess (ext-all-rtl-debug.js?_dc=1485867203820:13236)
at Function.process (ext-all-rtl-debug.js?_dc=1485867203820:13227)
at new ExtClass (ext-all-rtl-debug.js?_dc=1485867203820:13163)
at Ext.Inventory.create (ext-all-rtl-debug.js?_dc=1485867203820:14824)
Это из-за того, что синглтон?
