Tree filters not working

Hello;

       I was looking at a book, & it says that while in the design tree you can choose to type in one of the things after the filter icon, and it looks like you should be able to just see those items. Like type plane after the filter icon, and u'd only see the planes in the design tree. I tried that

and the planes don't show up; I see no features or anything. What am i missing?

      Thks in advance for any help;

                         rob_d (2009 Stimulus)

SolidworksParts And Features