You can display context-dependent panels with the Navigator window and the Navigator API. Typically, these panels are used by the NetBeans IDE editor for navigation in a document, for example,. Here, the constructors, methods, and additional elements of a Java class are displayed (see Figure 18-1). As a result, the user can navigate within the document. However, this is just one application case; the panels displayed in the navigator can be used for any purpose.