How to organize the import statements in multiple files in Zend Studio / eclipse?

In Zend Studio / eclipse there are some very useful code formatting functions, that can be applied to the whole file, multiple files, or even to a folder tree. E.g. "Format Source" (Ctrl+Shift+F) or "Remove Trailing Spaces" (Ctrl+Alt+Space). How to apply the function "Organize Imports" (Ctrl+Shift+O) to multiple files / a folder?