Changing position of slider automatically

?xml version="1.0" encoding="utf-8"?>
mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
mx:HSlider id="mySlider" value="{Number(userVal.text)}" minimum="0" maximum="100" labels="[0,25,50,75,100]"/>
mx:TextInput id="userVal"/>
mx:Application>