titlestring in vim

[bill]

The titlestring option in vim does a nice job of changing the title on 
xterms, but it doesn't seem to be updating my status line.  Does anyone 
have any experience with that?  My hardstatus string is:

"%{.bW}%-w%{.rW}%n %t%{-}%+w %=%{..G} %{..Y} %m/%d %C%a "

I thought the %t was basically equivalent to the xterm title.  I can 
modify it by echoing appropriately, but the vim builtin for setting the 
title ought to work.