Heirarchical menus selection

[osiris@cs.utexas.edu]

Is there any (simple) way do detect the selection of a heirarchical menu as
opposed to the selection of one of the items that it contains?  I notoced
that there is nothing equivalent to menu-item-action for menus.  

Thanks.

P.S. I know that this is not exactly kosher interface behavior, but in this
case I think that it makes sense...