Button wont work

Hi Guys!

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

HTML 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 wont work

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