XmCreateToggleButtonGadget(3) on Linux
The text 84c82303702f, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
The ToggleButtonGadget creation function "XmCreateToggleButton\%Gadget" "creation functions" "XmCreateToggleButton\%Gadget"