How to deploy 3 config files into the setup project?

Question

I have 3 projects inside 1 solution [VisualStudio2008]

-Project1: Library project. Output 1 dll and 1 .config in the Debug folder

-Project2: Library project. Output 1 dll and 1 .config in the Debug folder

-Project3: Main project. It will reference to Project1 and Project2 to get the library. My problem is when i compile project 3, i just got 1 exe and 1 config of project3, 2 dll files, the debug folder of Project3 didn't include 2 config files of library projects.

I tried to add these 2 config file by copying manually from Debug folder of Project1and Project2 to Debug folder of Project3. But, it didn't work. I tried to modify the setting in these 2 config files, but nothing change.

Any suggestion so far . Thanks