javascript - Sencha Architect create override -


I want to create an override for Ext.MessageBox. I have manually created an override file and pointed to JS resource for it. Now the architect looks at this file as an override but I get an error when calling the override function if I ext. I see the message box object and there is no new function. How can I specify override in architecture? What excautely am I wrong?

/app/overrides/MessageBox.js 

  Ext.define ('myapp.override.MessageBox', {override: 'extra messagebox ', Test: function () {alert ("123");}});   
  Calling :  Ext.MessageBox.test ();   
  returns :  UnkeyType error: There is no method in object [object object] 'test'   < / div> 
 
 
 The message box is a singleton, which you can not override in this way.  
 You can add things like MessageBox to code:  
 Ext.MessageBox.test = function () {alert ('123'); });

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