<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/11/06/disabling-live-scrolling-on-a-flex-textarea-control/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:String id="lorem" source="lorem.txt" />

    <mx:ApplicationControlBar dock="true">
        <mx:CheckBox id="checkBox"
                label="liveScrolling:"
                labelPlacement="left"
                selected="true" />
    </mx:ApplicationControlBar>

    <mx:TextArea id="textArea"
            text="{lorem}"
            liveScrolling="{checkBox.selected}"
            editable="false"
            condenseWhite="true"
            width="100%"
            height="100%" />

</mx:Application>