box-o-sand/00-custom-app/CustomApp.as

package
{
    import mx.core.Application;
    import mx.controls.Alert;
    import flash.events.MouseEvent;

    public class CustomApp extends Application
    {

        function CustomApp()
        {
        }

        public function butterCup(event:MouseEvent):void
        {
            var msg:String = "clicked" + event;
            trace(msg);
            Alert.show(msg);
        }

    }
}