There is a series of navigation functions that you can use for the tool area:

Single step navigation (previous object and next object)

You can navigate separately in the navigation and tool areas of the Object Navigator. Navigation in one area does not automatically update the other.

The previous object and Next object functions allows you to navigate forwards and backwards in the tools. You can access the functions from the application toolbar and the navigation stack. They are useful for switching quickly between two navigation targets in a stack.