I want to pause and clear a particle system and be able to start it again, but I am using the Sparkle Rising particle which has no Particle System?

Hello, I have the default 'Sparkle Rising' asset particle to make an in-game item sparkle, but I want it to stop when I do something but start again when I want to. I have tried doing ParticleSystem.Stop and wrote this script

 #pragma strict
 
 private var myParticles : ParticleSystem;
  
 function Start()
 {
     myParticles = GetComponent(ParticleSystem);
  
  }
  
  //myParticles.Stop(); to stop particles, myParticles.Clear(); to erase them
  
  function Update() {
  if(ClickChest.selected == true){
  myParticles.Stop();
  myParticles.Clear();
  }
  
 if(ClickChest.selected == false){
 myParticles.Play();
 }
  }

but there is no particle system on this particular particle. I tried adding one, but it did nothing. Is there a way to stop the emitter or something? Thanks.