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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>