Why doesn't Visual Studio refresh the folders when I click the Solution Explorer refresh button?

Question

In Visual Studio 2008, I can see all my project files in my Solution Explorer, and these files exist in an actual diectory.

However, if I add a file to that directory

Answer 1

On the solution explorer the top rightest icon (Show all files), press it and you will see the file visible, then right click the file and choose: include this to project.