I added a launch function to my Ext.application.
I believed that this override the old content of launch function.

I explain :

I began my project with Sencha Architect 2.0. I updated today with 2.1.

In my app.js, i had by default:
launch: function() {
Ext.create('MyApp.view.Main', {fullscreen: true});

but i would like to have :
launch: function() {
MyApp.main = Ext.create('MyApp.view.Main', {fullscreen: true});

How to realize this with Sencha Architect ?