Toggle button font size between null and 8

       
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        public function toggleStyle():void {
            if (cb1.selected == true) {
                b1.setStyle("fontSize", 8);
            } else {
                b1.setStyle("fontSize", null);
            }
        }
      
            </mx:Script>
    <mx:Style>
    @namespace mx "http://www.adobe.com/2006/mxml";
    mx|Button { 
       color: red; 
       fontSize: 25; 
    }
    </mx:Style>
    <mx:Button id="b1" label="Click Me" />
    <mx:CheckBox id="cb1" label="Set Style/Unset Style" click="toggleStyle()" selected="false" />
</mx:Application>

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Toggle button font size between null and 8 : ToggleButton « Components « Flex

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