If a package A adds an exteinson to a class from different package B then the extended class from package B is grayed out and all methods that are not part of the package A too.
I went through the Nautilus pdf and it seems to explains most of the thing but the grey out text. Any idea why some classess and methods are grey out ?By the way congratulation to Nautilus author and all people contributing to it , it certainly looks� like a big improvement over the classic system browser.