GLADEGUI directory contains all files needed to edit the GUI.
To edit the gui do the following:

0.Download and install glademm

1.Delete all files in GLADEGUI/src
2.Run GLADE and make changes
3.Save the changes and select the "Build" option
4.Copy all files from GLADEGUI/src (EXCEPT makefiles,main.cc and winMainWindow.cc !!!) to ui
5.Copy modified parts of winMainWindow.cc
6.Make any other changes
7.Run compile-???

There is a bug in glademm, so you have to manually fix radio menu items in winMainWindow_glade.cc.
This line:
mnuRepeat_menu->items().push_back(Gtk::Menu_Helpers::RadioMenuElem(_RadioMIGroup_, _("No progress")));
Has to be changed to:
mnuRepeat_menu->items().push_back(Gtk::Menu_Helpers::RadioMenuElem(_RadioMIGroup_mniRepNothing, _("No progress")));