Well, of course it's possible: The widgets can be stored in a tree-like data structure, which is constructed and modified by the UI editor, can be loaded and st

Well, of course it's possible: The widgets can be stored in a tree-like data structure, which is constructed and modified by the UI editor, can be loaded and stored in a file, and is interpreted by a runtime which calls the corresponding widget functions ooops we've just reinvented retained-mode GUIs.