checkmark on submenu items

[kevin]

Does anyone know how to mark submenu items with checkmarks? It seems 
that when I use the following code on an item that I know is part of a 
cascading menu, it takes that menu out of the submenu and puts it into 
the main menu:

put "!cSubmenu Item" into menuItem 2 of button "File"

I realize that the "!c" should be appended to the beginning of the item 
to yield the "check" but am stumped on how to implement this on a 
submenu. The Rev User Guide seems to indicate that this may not be 
possible but its not clear to me.

Many thanks!!

Kevin