Pb with ComboBox in grid Editor

Hello,

I have a problem with ComboBox editing of a Cell

Code:

{
                        header: 'Analytique',
                        dataIndex: 'id_analytique',
                        width: 150,
                        renderer : function(val) {
                                if(Ext.getStore('Analytiques').getById(parseInt(val)))
                                        return Ext.getStore('Analytiques').getById(parseInt(val)).data.nom;
                                else
                                        return "Non renseigné";
                        },
                        editor: Ext.create('Ext.form.ComboBox', {
                                typeAhead: true,
                triggerAction: 'all',
                                store: Ext.getStore('Analytiques'),
                                queryMode: 'local',
                                readOnly: false,
                                forceSelection: true,
                                displayField: 'nom',
                                valueField: 'id'
                        })
                }

The store is loaded OK (I see it in debug)

The rendered is OK (prouve that store is loaded)

The editor have no choice in ComboBox

With a simple array in store : ComboBox is OK

Why Ext.getStore() don't work for editor ? Can somebody help me please ?