Toolbar is a horizontal-oriented panel that can be used in different ways: for top level menu, for information panel, for tools-like menu and so on.
The following example shows how the panelBar might look like:

Tool Bar example 1
Tool Bar example 2

Items on the toolBar can be grouped with ability to define a separator between different groups and between a member of the same group. The "location" attribute set to "right" put a group to the right side of the panel.

Tool Bar Separator example