How to point to a specific compiler

Hello, I recently installed Visual Studio 2013 C compiler. I am using Matlab 2014a. When I type mex -setup it doesn't show the 2013 compiler option. Wondering if it could be because the compiler was installed after matlab. Is there a way to let matlab recognize the recently installed compilers.

[michio]

Just wanted to make sure if you have installed the professional version of Visual Studio 2013, not the "express".