package
{
    import flash.display.*;
    import flash.events.Event;

    public class Main extends MovieClip
    { 
        public function Main()  // Constructor
        {
            // Register the listener method that will be executed when the Document Class   is added to the Stage.
             addEventListener(Event.ADDED_TO_STAGE, handleAddedToStage);
         }

         private function handleAddedToStage(e:Event):void
         { 
             // Release the registered event listener after use to prevent potential malfunctions.
             removeEventListener(Event.ADDED_TO_STAGE, handleAddedToStage);

             // To do :

             // Set the text of tfMain that is to be displayed on the screen.
             // The tfMain that is created in the Stage is automatically included in the Document Class.
             tfMain.text = "Hello ActionScript";
          }
     }
}