Reg: ReferenceError: Window is not defined error

Hi Test Complete users,

I am very new to TestComplete tool and trying to record a script via BDD. Stuck up at this particular step where I am trying to select a timezone from list of timezones in our application: 

As shown in the screenshot, I can't select a single timezone group but entire window is being selected as an object when I use object spy. 

Can you please advice me on what should be done to select a single value from this list?

Note: This is a VB6 based application

Thanks,

Vandana