In SQL Navigator 6.0, viewing dependent objects in DB Explorer is not available. It used to be available on SQL Navigator 5.5.
Change in SQL Navigator application.
Dependent objects is available in DB Navigator by hitting the F12 function key or by selecting the View | DB Navigator menu option.
Since DB Explorer is part of Code Editor, development team has divided all database objects into two categories: those that can be opened/used in the Editor (tables, views, procedures, packages) and others.
Since having two different DB trees can be confusing, development team is planning to enhance DB Explorer in future versions so that it can completely replace DB Navigator.