<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/12/28/toggling-data-tips-on-the-hslider-control-in-flex/ -->
<mx:Application name="HSlider_showDataTip_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            private function checkBox_change(evt:Event):void {
                slider.showDataTip = checkBox.selected;
            }
        ]]>
    </mx:Script>

    <mx:ApplicationControlBar dock="true">
        <mx:Form styleName="plain">
            <mx:FormItem label="showDataTip:">
                <mx:CheckBox id="checkBox"
                        selected="true"
                        change="checkBox_change(event);" />
            </mx:FormItem>
        </mx:Form>
    </mx:ApplicationControlBar>

    <mx:HSlider id="slider"
            showDataTip="{checkBox.selected}"
            liveDragging="true" />

</mx:Application>