EXTJS Combox - Store does load but doesn't show
===

Given the following javascript:

    var fo = Ext.create('Ext.form.Panel', {
        layout:'box',
        ...
        items: [{
			xtype: 'combobox',
			valueField: 'id',
			displayField: 'organizationtype',
			store: {
				storeId: 'zaza',				
				fields: [{name: 'id'}, {name: 'organizationtype'}],
				root: 'data',
				autoLoad: true,
				proxy: {
					type: 'ajax',
					url: '/apps/crm_organizations/orgtype/',
					reader: {
						type: 'json'
					}
				}
			},
			fieldLabel: 'Type relation',
			name: 'organizationtype',
			queryMode: 'local',
		},
                ...

This panel contains - among other fields - also this combobox. I can see with wireshark that the url '/apps/crm_organizations/orgtype/' is actually queried. However the combobox doesn't show any values. Has this anything to do with the fact that I'm lazy loading the combobox?
