Things are moving slowly, but moving ... I try to write the infrastructure for a gimp2-like docker. With GtkMM and C++ code only. Ok, the path is long, here am I :

I know how to make a window (year, great), a notebook (amazing), and even VBoxes and Buttons (with Images too !). Well, for the little I've seen, the GtkMM API looks great, but I need more experience to ensure it is actually good. For you impatients, a little screenie of what's going on :