ok, sorry, but i'm not from England, or America I've got separated file with as: codeAs.as, and game file: game.fla. I know, when i set instance of button, then i have variable, with same name. And i have buttons in 1 frame: starter, and instructions. But, in second frame i've got button powrot_guz. And when i'm trying to add to it code like this: "owrot_guz.addEventListener(MouseEvent.CLICK, powrotKlik);" It return me erros like: "TypeError: Error #1009: Cannot access a property or method of a null object reference. at plikias::kodAs$iinit() " And show to this line of code It is now able to understand question? Thanks, Misiur.