title: ExtJS 4 “renderer” column on grid
body: <p>I've a grid that should execute a renderer on a column, but that don't show anything and neither recoignise record.</p>
  
  <p><strong>View</strong></p>
  
  <pre><code>Ext.define('Ab.view.maquina.MaquinaList', {
      extend: 'Ext.grid.Panel',
      alias: 'widget.maquinalist',
      store: 'Maquinas',
      tbar: [
          { text: _('Agregar'), action:'add'},
          { text: _('Editar'), action: 'upd'},
          { text: _('Eliminar'), action: 'del'}
      ],
      columns: [
          { text: _('Nombre'), flex: 1, dataIndex: 'nombre' },
           { text: _('Estado'), flex: 1, dataIndex: 'estado'},
          { text: _('Marca'), flex: 1, dataIndex: 'codigo', renderer: function(value, record){this.renderMarca(value, record)}} 
      ],
      renderMarca: function(value,record){
               console.log(value);  &lt; show value
               console.log(record.get('nombre')); &lt; error 
               return value; &lt; don't show value on the column
  
      }    
  });
  </code></pre>
  
  <p>Thanks </p>