I NTRODUCTORY SECTION CHAPTER 4: G ETTING STARTEDM86 S ECURITY USER G UIDE 61Navigate a Tree ListTree lists are included in the navigation panel of Policy andLibrary screens.Fig. 1:4-10 Tree menuA tree is comprised of a hierarchical list of items. An entityassociated with a branch of the tree is preceded by a plus(+) sign, when that branch of the tree is collapsed.By double-clicking the entity, a minus (-) sign replaces theplus sign, and all branches within that branch of the treedisplay.An item in the tree is selected by clicking it.