<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2009/02/13/creating-a-vertical-fxbuttonbar-control-in-flex-gumbo/ -->
<s:Application name="Spark_ButtonBar_layout_VerticalLayout_test"
        xmlns:fx="http://ns.adobe.com/mxml/2009"
        xmlns:s="library://ns.adobe.com/flex/spark"
        xmlns:mx="library://ns.adobe.com/flex/halo" viewSourceURL="srcview/index.html">

    <s:ButtonBar id="btnBar"
            horizontalCenter="0"
            verticalCenter="0">
        <s:layout>
            <s:VerticalLayout gap="-1" />
        </s:layout>
        <s:dataProvider>
            <s:ArrayList source="[Red,Orange,Yellow,Green,Blue]" />
        </s:dataProvider>
    </s:ButtonBar>
    
</s:Application>