frameworks/projects/spark/asdoc/en_US/spark/components/examples/TabBarExample.mxml

<?xml version="1.0"?>
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  Licensed to the Apache Software Foundation (ASF) under one or more
  contributor license agreements.  See the NOTICE file distributed with
  this work for additional information regarding copyright ownership.
  The ASF licenses this file to You under the Apache License, Version 2.0
  (the "License"); you may not use this file except in compliance with
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      http://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<!-- Simple example to demonstrate the Spark TabBar -->
<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">

    <fx:Style>
        @namespace "library://ns.adobe.com/flex/spark";

        TabBar ToggleButton:upAndSelected,
        TabBar ToggleButton:overAndSelected,
        TabBar ToggleButton:downAndSelected,
        TabBar ToggleButton:disabledAndSelected {
            chromeColor: #9999CC;
            color: #F00E34;
        }

        TabBar {
            chromeColor: #9999CC;
            color: #410FF5;
            cornerRadius:8;
        }
    </fx:Style>

    <fx:Script>
    <![CDATA[
         import spark.events.IndexChangeEvent; 

         private function changeSelection(event:IndexChangeEvent): void {
             selectionText.text = "Selected Item: " + TabBar(event.target).selectedItem;
         }
    ]]>
    </fx:Script>

    <s:Panel title="Spark TabBar Example"
            width="75%" height="75%"
            horizontalCenter="0" verticalCenter="0">
        <s:Label text="Select an item below:" x="10" y="15" />
        <s:TabBar id="viewMenu" x="10" y="40" width="320"
                change="changeSelection(event)">
            <s:dataProvider>
                <s:ArrayCollection source="['Appetizers', 'Entrees', 'Desserts']" />
            </s:dataProvider>
        </s:TabBar>
        <s:Label x="10" y="75" id="selectionText" />
    </s:Panel>

</s:Application>