Applying Design-Time stylesheets to multiple files at once... possible?

Any way to Design-Time a stylesheet across multiple files at once?

In other words, I want a folder containing 100 html files (that happen to 
all be raw data includes) to show me the stylesheet of the website proper 
when I'm editing them individually in dreamweaver.

I'd rather not have to hit Text / CSS Styles / Design Time on a
file-by-file 
basis.

Thanks!