Use child tags with the dot notation to define property overrides

           

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    <!-- states\StatesSimpleChildTags.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:mx="library://ns.adobe.com/flex/mx" xmlns:s="library://ns.adobe.com/flex/spark">
    <s:states>
        <!-- Define the new view states. -->
        <s:State name="default" />
        <s:State name="NewButton" />
    </s:states>
    <s:VGroup>
        <s:HGroup>
            <!-- Disable Button in the NewButton view state. -->
            <s:Button id="b1">
                <s:label>Click Me</s:label>
                <s:label.NewButton>Disabled</s:label.NewButton>
                <s:enabled.NewButton>false</s:enabled.NewButton>
            </s:Button>
            <!-- Add a new child control to the VBox. -->
            <s:Button id="b2" label="New Button" includeIn="NewButton" />
        </s:HGroup>
        <!-- Define Button control to switch to NewButton view state. -->
        <s:Button label="Change to NewButton state" click="currentState='NewButton';" />
        <!-- Define Button control to switch to default view state. -->
        <s:Button label="Change to default view state" click="currentState='default';" />
    </s:VGroup>
</s:Application>

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Use child tags with the dot notation to define property overrides : Spark component « Components « Flex

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