03-25-2016, 12:16 AM
To put it simply, the Control Center UI is done in html+css. Nothing overly complicated... and alot more flexible for the time frame in which it was created. It still makes use of some "gtk" elements for window management and such. But short of that the "UI" is css. If you have any specific questions related to Control Center, Updater, or anything else I work on... feel free to ask away.