syntax for multiply-nested menus?

I'm having trouble figuring out the syntax to define a second-level nested menu.


Here's what I have:

! I create a user menu 'Form Letter...'
*Mops.umenulist: formletter

*Mops.formletter.text: Form Letter...
*Mops.formletter.m.entrylist:  smith bar

*Mops.formletter.m.l_smith: This is form letter smith inside the 'Form Letter' menu
*Mops.formletter.m.c_smith: Msg_Compose -form comp.form.smith

! The 'Form Letter...' menu also contains cascaded menu 'Bar...'
! This works fine.
*Mops.formletter.m.l_bar: Bar...
*Mops.formletter.m.t_bar: cascade
*Mops.formletter.m.m_bar: bar

*Mops.formletter.m.bar.entrylist:  jones baz 

*Mops.formletter.m.bar.l_jones: This is form letter jones inside the 'Bar' sub-menu
*Mops.formletter.m.bar.c_jones: Msg_Compose -form comp.form.jones

! Try to also create cascaded menu 'Baz...' inside the 'Bar...' menu.
! This does not work; it just produces a blank entry in the the 'Bar...' menu.
! What's the correct syntax for this (and the rest below)?
*Mops.formletter.bar.m.l_baz: Baz...
*Mops.formletter.bar.m.t_baz: cascade
*Mops.formletter.bar.m.m_baz: baz

! ...so by this point, none of this will work
*Mops.formletter.bar.m.baz.entrylist:  doe

*Mops.formletter.bar.m.baz.l_doe: This is form letter doe inside the 'Baz...' sub-menu
*Mops.formletter.bar.m.baz.c_doe: Msg_Compose -form comp.form.doe


I've tried all sorts of variations of the definition of the "Baz..." cascaded menu,
but haven't found one that works.  (Everything I try just creates an blank entry
inside the the "Bar..." menu.)

Can anyone provide the correct syntax?