Changing the color of the validation error message
<?xml version="1.0"?> <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Style>.errorTip { borderColor: #0000FF}</mx:Style> <mx:PhoneNumberValidator id="pnV" source="{phoneInput}" property="text" wrongLengthError="Please enter a 10-digit number." /> <mx:TextInput id="phoneInput" /> <mx:TextInput id="zipCodeInput" /> </mx:Application>