[amibroker] Problem with resetting the getperformancecounter()

[itmwh]

Hi, I am confused why the following codes fails to reset the 
getperformancecounter()?  Thanks for any help  / Tom

===========================================================

reset=ParamTrigger("reset time counter","Click to reset");
if(reset)

   {GetPerformanceCounter(True); }


  elapsed=GetPerformanceCounter()/1000; 
   RequestTimedRefresh(2);

Title=
"\nElapsed = "+ elapsed;