Apply style properties to the Button, myStyle, and global style names

       
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" creationComplete="initApp(event)">
    <mx:Style>
       .myStyle { 
          color: red; 
       }
    </mx:Style>
    <mx:Script>
        import mx.styles.StyleManager;
        public function initApp(e:Event):void {
            StyleManager.getStyleDeclaration("Button").setStyle("fontSize",24);
            StyleManager.getStyleDeclaration(".myStyle").setStyle("color",0xCC66CC);
            StyleManager.getStyleDeclaration("global").setStyle("fontStyle","italic");
        }
      </mx:Script>
    <mx:Button id="myButton" label="Click Here" styleName="myStyle" />
    <mx:Label id="myLabel" text="This is a label" styleName="myStyle" />
</mx:Application>

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Apply style properties to the Button, myStyle, and global style names : Button Style « Components « Flex

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