Yes because now you need to add ext.direct in programmatic way.
Try this:
In your app.js
Code:
launch: function() {
		Ext.direct.Manager.addProvider(Ext.app.DirectAPI);
	}
And this in your controller:
Code:
onLaunch: function(app) {
		var store = this.getUserStore();
		store.getProxy().api = {
			create: UserData.createUser,
			read: UserData.getUsers,
			update: UserData.updateUser,
			destroy: UserData.deleteUser
		};
		store.load();
	},