[gtkmm] Thin GUI with gtkmm

["Laughlin, Joseph V" <Joseph V Laughlin boeing com>]

Does anyone have any tips for how to structure an application so that
most of the application logic is not closely tied to the GUI toolkit?  

I'm writing an application, but I'm having difficulties with getting the
gtkmm code to communicate with the rest of the application logic.  I'm
trying to write the code such that I can easily port my application to
different toolkits and operating systems, but it's not coming along as
smoothly as I'd hoped.

If I need to clarify this question, please let me know!

Thanks,
Joe