package test.main
{
  public class Hello
  {
    public function hello():void {
      trace("hello");
    }
  }
}

var clazz:Class = flash.utils.getDefinitionByName("test.main.Hello") as Class;
var instance:Object = new clazz();
instance.hello();

// パッケージインポート
	public class MyApplication extends Application
	{
		
		public function MyApplication() {
			this.addEventListener(FlexEvent.CREATION_COMPLETE,initHandler,true,int.MAX_VALUE,false);
		}
		
		private function initHandler(event:FlexEvent):void {
			var clazz:Class = flash.utils.getDefinitionByName("test.main.Hello") as Class;
			var instance:Object = new clazz();
		}
	}

<?xml version="1.0" encoding="utf-8"?>
<my:MyApplication
	xmlns:mx="http://www.adobe.com/2006/mxml"
	xmlns:cm="http://my.domain/mxml"
	layout="absolute"
	creationComplete="init();">
	
	<mx:Script>
		<![CDATA[
			private function init():void {
			}
			
		]]>
	</mx:Script>
</my:MyApplication>

<?xml version="1.0" encoding="utf-8"?>
<my:MyApplication
	xmlns:mx="http://www.adobe.com/2006/mxml"
	xmlns:cm="http://my.domain/mxml"
	layout="absolute"
	creationComplete="init();">
	
	<mx:Script>
		<![CDATA[
			private function init():void {
				var hello:Hello;
			}
			
		]]>
	</mx:Script>
</my:MyApplication>