ActionScript 3.0 :: [flex As3] Function Non Recursive Call?

I create standard AS3 flex project. In constructor goes only start();

rest of functions are basically this:
private start():void { f1();}
private function f1():void { f2();}
private function f2():void { f1();}

And it's standard recursion. SWF either breaks or loops as many times as I tell it. One f calls the other, which calls first... I do not want that. I want f1 to do some stuff, calls f1 and closes itself. Than f2 works, calls f1 and closes. And so on. Like having 2 sets of code that loops through.