<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2007/10/06/changing-a-flex-formitem-containers-indicator-skin/ -->
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="top"
        backgroundColor="white" viewSourceURL="srcview/index.html">

    <mx:Style>
        FormItem {
            indicatorSkin: Embed(source="assets/asterisk_yellow.png");
            indicatorGap: 24; /* pixels */
        }

        FormItemLabel {
            textAlign: left;
        }
    </mx:Style>

    <mx:Form>
        <mx:FormHeading label="FORM HEADING" />
        <mx:FormItem label="Name:" required="true">
            <mx:TextInput />
        </mx:FormItem>
        <mx:FormItem label="Email:" required="true">
            <mx:TextInput />
        </mx:FormItem>
        <mx:FormItem label="Phone number:">
            <mx:TextInput />
        </mx:FormItem>
    </mx:Form>

</mx:Application>