define the fontSize property with a value of 20 pixels

          
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Style>
        .myFontStyle { 
           fontSize: 20px; 
           color: #9933FF; 
        }
    </mx:Style>
    <mx:Button id="myButton" styleName="myFontStyle" label="Click Here" />
</mx:Application>

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define the fontSize property with a value of 20 pixels : Font « Graphics « Flex

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