RequestUpdateUI

I need to update internal window from other internal window. I tried to use RequestUpdateUI but I could not achive the positive result. As they said in manul I created the procedure inside required process with parameter:

PROCEDURE AskForRefresh(SomeParam string)

When I call RequestUpdateUI the above procedure is not called, i.e. process is not executed! When I commented the above code line (with PROCEDURE) and initiate update UI with

ExecuteProcess(IW_Window,trtRequestUpdate)

the process is executed but in this case I can't pass parameters. So I am stuck.

Could you please give me some advise? What I did wrong?