value = SetPageGadgetAttrsA(gad, page, win, req, tags)
D0 A0 A1 A2 A3 A4
ULONG SetPageGadgetAttrsA(struct Gadget *, Object *,
struct Window *, struct Requester *, struct TagItem *)
ULONG SetPageGadgetAttrs(struct Gadget *, Object *,
struct Window *, struct Requester *, ULONG, ...)