Flex – How to hide the vertical scroll bar (can’t help it)?

I have a list, but I want to hide the scroll bar but still retain the functionality. If I set verticalScrollPolicy = “off” to disable scrolling through the mouse wheel on Windows (100% of users use Windows). How to hide the scroll bar visually, but be able to scroll through the keyboard and mouse wheel?

 xmlns:mx="library://ns.adobe.com/flex/mx" 
 xmlns:s="library://ns.adobe .com/flex/spark" height="100%" width="100%">


 
 
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Just Input:

This code solves My question=)