i have a site which uses a dnn store module (among other modules). i'd like to make a few changes to it. however, when i navigate to my website using my FTP client, NOWHERE do i see ANY .cs files - even though the ascx files (such as ProductList.ascx) have .cs files as their codebehind files. so where oh where are all the .cs files hidden?

yep. i turned the filter off.
from the productlist.ascx header:
<%@ Control language="c#" CodeBehind="ProductList.ascx.cs" Inherits="DotNetNuke.Modules.Store.WebControls.ProductList" AutoEventWireup="True" %>

so the ascx.cs file should reside in the same folder as the ascx file.
is it possible that the SERVER is hiding these files from my ftp client?

so much for "open source"