Control animation play() and stop() from class

Hello,

I have created some functions to manage timed pause/play in an animation and I am trying to make a class from them, but it does not work, the play() and stop() functions I use have no effect. The functions work as intended when not in the class.

Here is my code:

package anim {
     import flash.utils.Timer;
     import flash.events.TimerEvent;
     import flash.display.MovieClip;
     
     public class Case extends MovieClip {

          public var tempsMulti:Number = 1.0;
          
          public function Case():void {
               trace("init");
               stop();
          }
          
          public function setTempsMulti(temps:Number):void {
               this.tempsMulti = temps;
          }

          public function attends(tps:Number):void {
               trace("attends");
               var temps:Number = tps * this.tempsMulti;
               
               var timer:Timer = new Timer(temps, 1);
               stop();
               
               timer.addEventListener("timer", this.suivant);
               timer.start();
          }
          
          private function suivant(event:TimerEvent):void {
               trace("suivant");
               play();
          }
     }
}

I checked that the functions are executed with the trace() and it is the case, so the problem really comes from the play() and stop() functions, and I do not receive any error at compilation or runtime.

Thanks for your help.