The Loaded Components pane, on the Design tab, distinguishes between classes and objects and displays these components within different tree menus.
On the Classes tab you see all loaded classes with their members (methods, fields, and properties) that can be accessed without the need of an object context. Normally these are static members and constructors.
When you instantiate a class, the created object is shown on the Objects tab with all instance members (methods, fields, and properties).
The two exceptions are Web services and Remote Objects. As an object instance is not required for Web Services (which are objects that expose static methods), all methods offered by Web services are shown on the Classes tab. Remote Objects, for example EJB home objects, which are used to create an EJB object, are also listed in the Classes tab, although they are in fact objects.