store is null

[metalinspired]

skirtle is right.
try adding this to StandardGraphStore

initComponent: function() {
  var store = Ext.getStore('StandardGraphStore');
  if (!store) {
    store = Ext.create('TAB.store.StandardGraphStore');
  }
  store.load();
}

[marxan]

Indeed it was the problem! Don't why I forgot to load it!

Here's my working code.

Thanks a lot for your help.

Ext.define('TAB.controller.GraphOptions', {    extend: 'Ext.app.Controller',
     model: ['StandardGraphModel'],
    stores: ['StandardGraphStore'],
    views: ['GraphOptions','StandardGraph', 'GraphContainer'],
 
    init: function () {
        var me = this;


        this.control({
        	 '#generateChart': {
                click: this.generateChart
            }
       })
    },
    
     generateChart: function (value){
 	 var grid = Ext.getCmp('StandardGraphId');
         var store = Ext.getStore('StandardGraphStore');	
         
         store.proxy.extraParams = {
	        	codes: Global.codeListToLoad
	        }
	        
         store.load();
	 Ext.widget('graphcontainer').show();
	}
    	
     }
});