[jQuery] Slider - value = function

[Elledinho]

Hi peoples.

I just wanted to ask... is is a bug that I cant use a function as
value of a Slider (UI) ?

fx:
$("#soundControl #setVolume").slider({
        range: "min",
        min: -3,
        max: 103,
        value: ytplayer.getVolume(),
});

This wont even show the slider because of the value of value
(ytplayer.getVolume())

What can I to make this work?