Xcode shortcut for finding where that file is! Perfect!

When using XCODE and writing apps, I often find myself trying to find files which related to each other in a particular folder. Either to open them or open related files of the group. So if I have a view, and want to see the associated components, I don't have to remember all the file names. Quickly we can jump to the file location and have a look around! You never realise how useful it is until you start using it...