Change global options doesn't work, loadingMessage

Change global options doesn't work, loadingMessage

Hey,

I'm doing this:

$( document ).bind( "mobileinit", function () {
            $( function () {
                $.extend( $.mobile, {
                    loadingMessage: "cargando",
                    backBtnText: "Atras"
                } );
//    $.mobile.loadingMessage = "cargando";
//    $.mobile.backBtnText = "Atras";
} );

Doesn't work, still the "loading" text appears, why? is this a bug? I'm using jquery mobile alpha2.

Thanks.