using SetTimer on GapiApplication

Hi,
A rather simple question but I got stuck. Newbie here. :) Anyone who can help me out in using SetTimer on GapiApplication? How do I reference the hWnd from GapiApplication.cpp and use it on my own cpp file?
Thanks in advance,
Erick :)
A rather simple question but I got stuck. Newbie here. :) Anyone who can help me out in using SetTimer on GapiApplication? How do I reference the hWnd from GapiApplication.cpp and use it on my own cpp file?
Thanks in advance,
Erick :)