Gets or sets whether NavBarGroup borders should be displayed.
true, if NavBarGroup borders should be displayed; otherwise, false.
The ShowBorder property specifies whether NavBarGroups within the current View should display their borders.
Some Themes can override the ShowBorder property. For example, in Office 2013 theme NavBarGroups do not have borders, and they are unaffected by the ShowBorder property setting.
The following figure illustrates the ExplorerBarView with the Seven theme applied, along with different ShowBorder property settings.