Use the errorTip style to change the color

           

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    <!-- validators\PNValidatorErrMessageStyle.mxml -->
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
    xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">
    <s:layout>
        <s:VerticalLayout />
    </s:layout>
    <!-- Use blue for the error message. -->
    <fx:Style>
        .errorTip { borderColor: #0000FF} 
    </fx:Style>
    <fx:Declarations>
        <!-- Define the PhoneNumberValidator. -->
        <mx:PhoneNumberValidator id="pnV" source="{phoneInput}"
            property="text" wrongLengthError="Please enter a 10-digit number." />
    </fx:Declarations>
    <!-- Define the TextInput control for entering the phone number. -->
    <s:TextInput id="phoneInput" />
    <s:TextInput id="zipCodeInput" />
</s:Application>

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Use the errorTip style to change the color : Style Color « Style « Flex

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