The program isn't finished but might help people that are doing the GTK3+Glade approach in Python 3 using PyGobject. You can also message me here or on Github if you have questions.
Thanks to everyone on this board. I don't post often but read a lot of stuff on here, and it is always helpful. Also a big thankyou to errol, who helped me get started last year!
Setup: GTK 3.12, Python 3.4, Glade 3.18, Matplotlib 1.4, Ubuntu 14.10 (64bit) and Gedit. (http://gtk3-matplotlib-cookbook.readthedocs.org