Slider: method destroy does not remove ui-slider-range

Hello UI team !!!

Here goes bug explanation:

taken from demo range slider: http:jqueryui.com/demos/slider/#range

$J("#slider-range").slider({

range: true,

min: 0,

max: 500,

values: [75, 300]

});

then after

$("#slider-range").slider("destroy")

still exists inner <div class="ui-slider-range ui-widget-header" style="left: 15%; width: 45%;"/>

Thank you for your work.