Specify an id value if you intend to refer to a component elsewhere in your MXML

           

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<!-- controls\rule\RuleSimple.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark"
    xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:VGroup>
        <mx:Label text="Above" />
        <mx:HRule />
        <mx:Label text="Below" />
        <s:HGroup>
            <mx:Label text="Left" />
            <mx:VRule />
            <mx:Label text="Right" />
        </s:HGroup>
    </s:VGroup>
</s:Application>

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Specify an id value if you intend to refer to a component elsewhere in your MXML : MXML « Development « Flex

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