Erro(c.store is undefined) when load: combobox

[zeneto]

I have a problem like you help.
I have the following codes:

Model:

Ext.define('EstudoExt.model.Estado',{
    extend: 'Ext.data.Model',
    idProperty: 'modelEstado',
    fields: [
    {
        name: 'id_estado', 
        type: 'int'
    },
    {
        name: 'nome', 
        type: 'string'
    }
    ]   
});

Store:

Ext.define('EstudoExt.store.Estados',{
    extend: 'Ext.data.Store',
    model: 'EstudoExt.model.Estado',
    storeId : 'Estados',
    autoLoad: true,
    proxy: {
        type: 'ajax',
        url: 'data/estados.json',
        reader: {
            root: 'data',
            type: 'json',
            successProperty: 'success'
        }
    }
});

Combo:

Ext.define('EstudoExt.view.pessoaJuridica.ComboEstado', {
    extend: 'Ext.form.field.ComboBox',
    alias: 'widget.estadoCombo',
    name : 'id_estado',
    ref: 'id_estado',
    fieldLabel: 'Estados',
    store: 'Estados',
    displayField: 'nome',
    valueField: 'id_estado',
    queryMode: 'local',
    typeAhead: true,
    forceSelection: true,
    initComponent: function() {
        this.callParent(arguments);
    }
});

Ext.require('EstudoExt.view.pessoaJuridica.ComboEstado');

Ext.define('EstudoExt.view.pessoaJuridica.Edit', {
    extend: 'Ext.window.Window',
    alias : 'widget.pessoaJuridicaEdit',
    title : 'Edição de Pessoa Juridica',
    layout: 'fit',
    autoShow: true,
    modal: true,
    width: 300,
    height: 450,
    initComponent: function() {
        this.items = [{
                xtype:'tabpanel',
                activeTab: 0,
                defaults:{
                    bodyStyle:'padding:10px'
                },
                items:[{
                        title:'Dados da Empresa',
                        defaultType: 'textfield',
                        items: [{
                                xtype: 'estadoCombo'
                            },{
                                fieldLabel: 'Nome Fantasia',
                                name: 'nome_fantasia',
                                allowBlank: false
                            },{...

when the view loads I get the error: c.store is undefined (ext-all.js - line 15)
I don't know what happened!

[mitchellsimoens]

First you should be using ext-debug.js during development which will tell you more information and dynamically load Ext JS classes. Did you create an instance of the store?

[zeneto]

The problem was exactly that! I had called the Store on my controller.

Thank you!!!