horse/resource/eui_skins/VSliderSkin.exml

<?xml version="1.0" encoding="utf-8"?>
<e:Skin class="skins.VSliderSkin" minWidth="25" minHeight="30" xmlns:e="http://ns.egret.com/eui">
    <e:Image id="track" source="track_png" scale9Grid="1,1,4,4" width="7" height="100%" horizontalCenter="0"/>
    <e:Image id="thumb" source="thumb_png" horizontalCenter="0" />
</e:Skin>