You can use the GTK Inspector to look through an open program to see what widgets it uses. It should be easy to understand if you're familiar with the Chrome/Fi

You can use the GTK Inspector to look through an open program to see what widgets it uses. It should be easy to understand if you're familiar with the Chrome/Firefox debuggers. https://wiki.gnome.org/Projects/GTK/Inspector https://wiki.gnome.org/Projects/GTK/Inspector What you'll find is that several GNOME apps use separate widget libraries like libdazzle and libhandy to get their look-and-feel. These aren't necessary, but they may save you some work to make your program feel a little bit more GNOME-like. https://gitlab.gnome.org/GNOME/libdazzle https://gitlab.gnome.org/GNOME/libdazzle https://source.puri.sm/Librem5/libhandy https://source.puri.sm/Librem5/libhandy