"Filter for ..." command on shortcut menu

I posted this in the
microsoft.public.access.commandbarsui group yesterday,
but there's been no response so far, so I'll try here.

The Datasheet View Cell menu (I'm using Access 2000) has
a "Filter For" command - it has a text box beside it
into which you can enter criteria eg. "a or b". I want
to create a custom right-click menu for a form with this
command as one of the options, but it doesn't appear in
the list of commands available when I try to customize my
menu. All the other Filter ... commands are available in
the Records category, but not the one I want. I can't
find it in any other category either. Where is it, and
how can I add it to my custom menu?

TIA,

Rob