searching in marketpress

on your marketpress demo site

http://wp-ecommerce.org/

the search works how I would imagine it... But on my site with gridmarket theme, my search just looks like a standard wordpress search... ie just a few lines of unformated info about each post.

I would like to search for specific tags and have the products come up in a nice format exactly how you have got on your site.... Have I missed something in my setup?