Changing CSS Selectors

        
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="vertical">
  
  <mx:Script>
    
      private function setLabelFont():void
      {
        var style:CSSStyleDeclaration = new CSSStyleDeclaration();
        style.setStyle("fontSize", 18);
        style.setStyle("fontWeight", "bold");
        StyleManager.setStyleDeclaration("Label", style, true);
        
      }
  
  </mx:Script>
  <mx:Style>
  @namespace mx "http://www.adobe.com/2006/mxml";
    mx|Label {
      font-size:12;
    }
  </mx:Style>
  
  <mx:Label text="Hello World"/>
  
  <mx:Button label="Change Label Font" click="setLabelFont()"/>
  
</mx:Application>

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Changing CSS Selectors : CSS « Style « Flex

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