改变HSlider上标记的宽度.

tickThickness属性。
示例：

代码：

 

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/05/06/setting-the-tick-thickness-on-a-slider-control-in-flex/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Form>
        <mx:FormItem label="tickThickness:">
            <mx:HSlider id="slider"
                    minimum="1"
                    maximum="4"
                    liveDragging="true"
                    snapInterval="1"
                    tickInterval="1"
                    tickThickness="{slider.value}"  />
        </mx:FormItem>
    </mx:Form>

</mx:Application>

http://blog.flexexamples.com/2008/05/06/setting-the-tick-thickness-on-a-slider-control-in-flex/