XmVaCreateManagedRowColumn(3) on Linux
The text 5697e085e552, as Debian 13 (Trixie), Debian 12 (Bookworm), Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
A RowColumn widget convenience creation functions. "XmVaCreateToggleRowColumn" "XmVaCreateManagedRowColumn" "creation functions" "XmVaCreateRowColumn"