Use getStyleDeclaration() to apply the styles with the global selector

         
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="initApp(event)">
    <mx:Script>
        public function initApp(e:Event):void {
            StyleManager.getStyleDeclaration("global").setStyle("fontSize", 22);
            StyleManager.getStyleDeclaration("global").setStyle("textDecoration", "underline");
        }
      </mx:Script>
    <mx:Button id="myButton" label="Click Here" />
    <mx:Label id="myLabel" text="This is a label" />
</mx:Application>

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22.	Use getStyleDeclaration() method to apply the styles with the global selector example shows

Use getStyleDeclaration() to apply the styles with the global selector : CSS Selector « Style « Flex

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