Interface trick (main swf –> load external swf and want to call it function) July 23, 2010July 2, 2022 http://www.zedia.net/2008/another-good-use-of-interfaces/ 同場讀埋，interface 有咩用？ http://www.zedia.net/2008/how-to-use-interface-in-actionscript-3/