>  	var store = Ext.create('Ext.data.Store', {
> -	    fields: [ 'iface', 'active', 'type' ],
> -	    filterOnLoad: true
> +		fields: [ 'iface', 'active', 'type' ],
> +		filterOnLoad: true
>  	});
> +	store.sort( 'iface', 'ASC' );
Also, seems you call 'sort' before you got any data, so you always sort an empty store?