hiding the shopping cart

I'm not sure if this is a marketpress thing or a gridpress thing...

My client has decieded to "ease in" to online selling, and would like to start off with just a catalog/gallery... upgrading to a full blown store later. I wish she had said so earlier, as her site is already built with marketprss and gridpress, and, except for her reluctance to use the store functionallity, she is very happy with the results.
I've indicated that that wasn't a problem as we can easily disable/reinable the store at any time.

Seems I might have been mistaken.I've mapped the "buy now" buttons to a contact form, and selected the "product listings only" only option. So far, so good.

My problem is that I can't seem to hide the ajaxified cart at the top of the pages. As usual, I'm sure I'm just missing something obvious.