set Label Visibility Mode
Sets the navigation items' label visibility mode.
The label is either always shown, never shown, or only shown when activated. Also supports "auto" mode, which uses the item count to determine whether to show or hide the label.
Parameters
label Visibility Mode
mode which decides whether or not the label should be shown. Can be one of LABEL_VISIBILITY_AUTO, LABEL_VISIBILITY_SELECTED, LABEL_VISIBILITY_LABELED, or LABEL_VISIBILITY_UNLABELED