<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/05/setting-the-text-alignment-on-a-tabbar-control-in-flex/ -->
<mx:Application name="TabBar_tabStyleName_textAlign_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <mx:Script>
        <![CDATA[
            import mx.controls.TabBar;

            private var arr:Array;
            private var tabBar:TabBar;
            private var customTabStyleName:CSSStyleDeclaration;

            private function init():void {
                arr = [];
                arr.push({label:"Red"});
                arr.push({label:"Orange"});
                arr.push({label:"Yellow"});
                arr.push({label:"Green"});
                arr.push({label:"Blue"});

                customTabStyleName = new CSSStyleDeclaration(".customTabStyleName");
                customTabStyleName.setStyle("textAlign", "left");

                tabBar = new TabBar();
                tabBar.dataProvider = arr;
                tabBar.setStyle("tabWidth", 120);
                tabBar.setStyle("tabStyleName", "customTabStyleName");
                addChild(tabBar);
            }
        ]]>
    </mx:Script>

</mx:Application>