PowerBuilder6.5: Could not find the definition for user defined function [on hold]

I am looking into the application code developed by a former colleague.

I want to view the function definition called using OLE custom control object as below

w_station.ole_cbm.object.CalFee(ldt_entry_date,ldt_entry_time,datetime(today(),Now()))

I am looking for the definition of CalFee Function, but I ended up finding nothing.

I checked for the global function declaration, local function declaration everything, but could not find the function declaration/definition. I don't have any clue where I could find the function declaration. Even I tried playing with the function name, but I am not getting any compilation error. May be because Power Builder accepts the property and function call during compile time and throws error only during run time.

So Later I tried to build the .exe file, and ended up with the error calling DLL library for external function call for some other function.

Also checked events and function defined for the OLE Custom Control.

Precisely I want to know the place where the user defined functions definition is being stored in powerbuilder.