I went thought the Extjs4 api and could not find the proper way to get an model instance by Ext.ModelMgr api other than Ext.ModelMgr.create(). There was a sample in the Blog

Code:
Ext.regModel('User', {
    fields: ['id', 'name', 'age'],
    proxy: {
        type: 'rest',
        url : '/users',
        reader: {
            type: 'json',
            root: 'users'
        }
    }
});

var UserModel = Ext.getModel('User');
var ed = new UserModel({
    name: 'Ed Spencer',
    age : 25
});
 
ed.save({
    success: function(ed) {
        console.log("Saved Ed! His ID is "+ ed.getId());
    }
});
I expected there would be a corresponding like this

Code:
var UserModel = Ext.getModel('User');
var newUser = new UserModel({});

newUser.load(123, {
    success: function(newUser) {
        console.log("Loaded user 123: " + newUser.get('name'));
    }
});
I was not able to make this work. Anybody know what's wrong with that?