XmToggleButtonGadgetSetState(3) on Linux
The text a2beb9943646, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A ToggleButtonGadget function that sets or changes the current state "XmToggleButtonGadgetSet\%State" "ToggleButtonGadget functions" "XmToggleButtonGadgetSet\%State"