Using Spark namespace for the Button components and the MX namespace for the Box containers

           

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    <!-- styles/NamespaceIdentifierExample.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"
    xmlns:myComps="*">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <fx:Style>
        @namespace s "library://ns.adobe.com/flex/spark";
        @namespace mx "library://ns.adobe.com/flex/mx";
        s|Button {
            fontSize:16;
        }
        mx|VBox {
            color:red;
        } 
    </fx:Style>
    <mx:VBox>
        <!-- This Spark button is red, and has a fontSize of 16. -->
        <s:Button label="Click Me, Too" />
    </mx:VBox>
</s:Application>

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Using Spark namespace for the Button components and the MX namespace for the Box containers : CSS « Style « Flex

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