Is there any Presentation Model's EndLife method?

Hello community,

I have created a new PM for an applet. Basically, I want to set one profile attribute whenever a field is changed (somehow I cannot catch this event anywhere, only using FieldChange of the PM, probably because it involves a BC  with a specialized virtual class).

So I defined 3 global variables:

  var inPS;

  var outPS;

  var service;

Which I initialize in the Init method:

  HomeSearchTTPM.prototype.Init =

  function ()

  {

  ******************* OTHER CODE **************

  service = SiebelApp.S_App.GetService("SIS OM PMT Service");

  inPS  = SiebelApp.S_App.NewPropertySet();

  outPS = SiebelApp.S_App.NewPropertySet();

  inPS.SetProperty("Profile Attribute Name", "MY_PROFILE_ATTRIB");

  };

I am using global variables because I do not want to instantiate those objects every time the field value changes. And it is working fine. I just do not know the best place to clear those variables (setting them to null) in PMs. For PR the logic answer would be the EndLife method.