This procedure is defined in the server but not documented via ad_proc or proc_doc and may be intended as a private interface.
The procedure is defined as:
proc ::nx::internal::setSlotContainerProperties {baseObject containerName} {
set slotContainer ${baseObject}::$containerName
$slotContainer ::nsf::methods::object::requirenamespace
::nsf::method::property $baseObject -per-object $containerName call-protected true
::nsf::method::property $baseObject -per-object $containerName redefine-protected true
#puts stderr "::nsf::method::property $baseObject -per-object $containerName slotcontainer true"
#::nsf::method::property $baseObject -per-object $containerName slotcontainer true
::nsf::object::property $slotContainer slotcontainer true
}