Other FLTK widget opcodes are:
FLbox
FLbutBank
FLbutton
FLexecButton
FLkeyIn
FLhvsBox
FLhvsBoxSetValue
FLmouse
FLprintk
FLprintk2
FLslidBnk
FLslidBnk2
FLslidBnkGetHandle
FLslidBnkSet
FLslidBnk2Set
FLslidBnk2Setk
FLvalue
FLvkeybd
FLvslidBnk
FLvslidBnk2
FLxyin