Visual Studio 2012 “Show All Files” button missing

Question

In my solution I have three projects: Console application, class library, and a website project. The Show All Files button is visible on the console and class library proje

Answer 1

The "Show All Files" auto hides.

Click on the folder that has the hidden file, the button should show up.

By clicking on the project (the folder under the solution) the solution explore checks if all sub folders has hidden file, this will prompt the button to be revealed.