You are incorrect they do and it is amazing. Here is a slider that I made into a QControl and I have all the normal slider stuff, but then have the extra stuff I added. It isn't perfect, like you can see the "Scale" normally opens up another submenu but in this case it just returns a reference, but with this you can then do the same stuff. Or you can just reference the original control instead of this class and do things exactly like you always have but you won't have the new items.