We have already seen the system browser in Chapter 1, where we learned how to navigate to classes and methods, and saw how to define new methods. Now we will see how to create system categories and classes.
\(\bigstar\) Open a system browser and yellow-click in the category pane. Select
add item ....
Type the name of the new category (we will use SBE-Quinto) in the dialog box and click
accept (or just press the return key); the new category is created, and positioned at the end of the category list. If you selected an existing category first, then the new category will be positioned immediately ahead of the selected one.