<?xml version="1.0" encoding="utf-8"?>

<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"

                layout="vertical"

                verticalAlign="middle"

                backgroundColor="white">

    <mx:Style>

        .myCustomButtonStyleName {

            cornerRadius: 16;

        }

    </mx:Style>

    <mx:Array id="arr">

        <mx:Object label="Button" />

        <mx:Object label="ButtonBar" />

        <mx:Object label="CheckBox" />

        <mx:Object label="ColorPicker" />

    </mx:Array>

    <mx:ButtonBar id="buttonBar" buttonStyleName="myCustomButtonStyleName" dataProvider="{arr}" height="32" />

</mx:Application>