mustella/Assets/Components/TrixSparkHScrollBar.mxml

<?xml version="1.0" encoding="utf-8"?>
<s:HScrollBar 
    xmlns:fx="http://ns.adobe.com/mxml/2009" 
    xmlns:mx="library://ns.adobe.com/flex/mx" 
    xmlns:s="library://ns.adobe.com/flex/spark" 
    width="100" height="25">
</s:HScrollBar>