The only thing to do in the .fla is add “StarterClass” in the Document Class field under properties or under Publish Settings > Flash > Settings >Document Class. The actionscript has to be Version 3.

package {

import flash.display.MovieClip;

public class StarterClass extends MovieClip {

public function StarterClass() {

trace(“Starter class…..√ check”);

myMethod();

}

private function myMethod():void {

trace(“myMethod……….√ check”);

}

}

}

starter_class.zip