Flex :: Applying Stylesheet To Slider Without MXML

I have a few styles that I want to apply to a slider. I'm aware of the MXML method of defining a mx:Style tag

<mx:Style>
HSlider{
} .SliderHighlightTrackSkin{
} .SliderTrackSkin{
} .SliderThumbSkin{
}
</mx:Style>

Instead of doing it this way I want to define all the styles in a style sheet. I then want to define my slider in a .as file (not an mxml file) and apply the stylesheet to it. Something like the following is what I'm after

levelSlider= new VSlider()
levelSlider.minimum=0;
levelSlider.maximum=1;
levelSlider.value=1;
levelSlider.y=150
levelSlider.styleName="sliderStyle.css"
this.addChild(levelSlider)