Progress box on save

[Bill Vlahos]

I have a stack which sometimes takes a long time to save so I'd like to 
put up a message with a progress bar (or even a static one is OK) while 
I save it so the user knows that something is happening and it just 
isn't finished yet.

Ask and Answer won't work because they require the user to do something 
to get them started. I might want to allow the user to cancel the save 
but probably not even that.

Rev does something like what I want when it saves a stack except there 
is no progress bar but it isn't obvious to me how they do it.

Bill Vlahos