Error widget inheritance

Error widget inheritance


Hi
i'm trying to create my own widget from ui.tabs this is the code:
    $.widget("ui.mantecaoTabview", $.extend({}, $.ui.tabs.prototype, {
        prueba: function(){
            alert('executed....');
            return 'test ejecutada';
        }
}));
    $.extend($.ui.mantecaoTabview,$.ui.tabs);
    $("#rotator").mantecaoTabview({
        fx:{opacity: "toggle"},
        spinner: '',
        load: function(e, ui){
            e.prueba();
        }
    });
i don't get what is wrong with my code, could you help me. Firebug
return this error:
"e.prueba is not a function"
e.prueba();