Gets or sets an object representing the group's selected item. This is a dependency property.
A NavBarItem object representing the group's selected item. null (Nothing in Visual Basic) if none of group items are selected.
Read the SelectedItem property value to obtain the NavBarItem object representing the selected item within the group's NavBarGroup.Items collection. Assign a NavBarItem object to this property to select the item.
To learn more, see the Clicking and Selecting Items topic.