Style Flex

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  4. Use the errorTip style to change the color

    
    xmlns:s="library://ns.adobe.com/flex/spark" xmlns:mx="library://ns.adobe.com/flex/mx">
    
        
    
    
    
        .errorTip { borderColor: #0000FF} 
    
    
        
                    property="text" wrongLengthError="Please enter a 10-digit number." />