How to capture the drilldown event in List Applet

 Hi Everyone,

I have a requirement where i have to capture the drilldown event on a list applet. I tried overriding the PHYEVENT_DRILLDOWN_LIST event in presentation model as mentioned below but it does not work. Do i need to do any changes to the physicalrenderer ? or am i missing something here?

if( typeof( SiebelAppFacade.ExpandPModelPM ) === "undefined" ){

   SiebelJS.Namespace( "SiebelAppFacade.ExpandPModelPM" );

   SiebelApp.S_App.RegisterConstructorAgainstKey( "ExpandRecordPModel", "SiebelAppFacade.ExpandPModelPM" );

   SiebelAppFacade.ExpandPModelPM = ( function(){

        var consts  = SiebelJS.Dependency( "SiebelApp.Constants" );    

       function ExpandPModelPM(proxy){

           SiebelAppFacade.ExpandPModelPM.superclass.constructor.call( this, proxy );

       }

       SiebelJS.Extend( ExpandPModelPM, SiebelAppFacade.ListPresentationModel );

       ExpandPModelPM.prototype.Init = function(){

           SiebelAppFacade.ExpandPModelPM.superclass.Init.call( this );