OutputCache directive interferes with page styling

I have a page that contains some clever CSS styling to manage its column layouts as well as an Ajax AlwaysVisibleControlExtender; both contained within a MasterPage. When I applied the @OutputCache declaration neither the styling nor the control extender worked. I solved the problem by changing my approach to specifying my cache policy to a programmatic one, via the Response.Cache methods and set them in my Page_Load routine.