Button wont work

Hi Guys!

I have a strange problem. In scene 1 is a button with the following code:

welcome.addEventListener(MouseEvent.CLICK, clickHandler_start);
function clickHandler_start(event: MouseEvent): void {
gotoAndStop(2)
}

However, this code works only if in scene 2 the same button is added to the stage.

if the button (in scene 2) is removed, the code will not work

Fla to download and test: http://app-developing.eu/tfzfleitfaden/leitfaden.fla