That highly depends on the libraries you're using. Every one can have (and will have) a different license.
For the specific product, you see the licensing terms here: http://mfly.codeplex.com/license. In short: For this library, you might distribute it freely to your customers, even if you sell your product. You should not charge something for the library itself, though. And you must include the copyright notice in your product and offer anybody buying your product to get the source code of the library (not your product).