VC++ New Header Files

I'm using VC++ 2010, and already have a project working from a downloaded example. I 开发者_Go百科go to add a new header file, but it doesn't show up when trying to add it in a cpp file. Is there like a refresh thing I need to do? I complie the project before trying to include it in a cpp file but nothing shows up.

Any ideas?

Thanks much,

David