Preventing the user from clicking the track on a Spark HSlider control in Flex 4

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2010/03/31/preventing-the-user-from-clicking-the-track-on-a-spark-hslider-control-in-flex-4/ -->
<s:Application name="Spark_HSlider_track_mouseEnabled_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:controlBarContent>
        <mx:Form>
            <mx:FormItem label="track.mouseEnabled:">
                <s:CheckBox id="chckBx" selected="true" change="chckBx_changeHandler(event);" />
            </mx:FormItem>
        </mx:Form>
    </s:controlBarContent>
 
    <fx:Script>
        <![CDATA[
            protected function chckBx_changeHandler(evt:Event):void {
                sl.track.mouseEnabled = chckBx.selected;
            }
        ]]>
    </fx:Script>
 
    <s:HSlider id="sl"
            horizontalCenter="0" verticalCenter="0" />
 
</s:Application>