通過設置.errorTip CSS選擇器的borderColor 樣式。
示例：

代碼：
<?xml?version="1.0"?encoding="utf-8"?>
<!--?http://blog.flexexamples.com/2008/05/22/changing-the-background-color-of-an-error-tip-in-flex/?-->
<mx:Application?xmlns:mx="http://www.adobe.com/2006/mxml"
????????layout="vertical"
????????verticalAlign="middle"
????????backgroundColor="white">

????<mx:Style>
????????@font-face?{
????????????src:?local("Base?02");
????????????fontFamily:?Base02Embedded;
????????}

????????.errorTip?{
????????????borderColor:?haloOrange;
????????????color:?black;
????????????fontFamily:?Base02Embedded;
????????????fontSize:?16;
????????????fontWeight:?normal;
????????}

????????TextInput?{
????????????errorColor:?haloOrange;
????????}
????</mx:Style>

????<mx:TextInput?id="textInput"
????????????errorString="Hey,?you?missed?a?spot!"?/>

</mx:Application>

來自：http://blog.flexexamples.com/2008/05/22/changing-the-background-color-of-an-error-tip-in-flex/

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