<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/06/04/setting-the-tick-length-on-a-slider-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Style>
        HSlider {
            tickLength: 10;
        }
    </mx:Style>

    <mx:HSlider id="slider"
            minimum="0"
            maximum="10"
            value="3"
            liveDragging="true"
            tickInterval="1" />

</mx:Application>