mojoPortal uses the Web Application Project type which compiles the code behind into dll files. It is not possible to just deploy code behind files with source code and have it work with this project type, that only works with Web Site Project type. I don't recommend deploying source code, but it is possible to create pages with inline code and no code behind file (by using a text editor to create them not VS) and then drop the page into the folder and it works. You can add it to the project after creating it but if you try to use VS to create it in the Web App project its going to make a code behind file.

Some notes about it here:

Using Inline Code

Hope it helps,

Joe