Man pages matching name xmtogglebuttongadgetsetstate in section 3:

XmToggleButtonGadgetSetState.3.en	debian 10 / libmotif-dev
XmToggleButtonGadgetSetState.3.en	debian 11 / libmotif-dev
XmToggleButtonGadgetSetState.3.en	debian 12 / libmotif-dev