Visual Studio 2008，右键单击时不再看到“刷新”项

I used to be able to right click Folders in my project and click 'refresh' to refresh the files within them, I don't see the option to do this any more, how do I fix it? The same thing has happened at work and at home.. has it always been like this and have I gone insane?I used to be able to right click Folders in my