The ContextualTabGroupCollection class represents all groups of ribbon tabs which are only shown in a certain context. Each ContextualTabGroup object contained in the collection represents one group of tabs. A Ribbon control manages a collection of contextual tab groups, which is available through the ContextualTabGroups property.
[C#] public class ContextualTabGroupCollection : System.Collections.Generic.List<ContextualTabGroup>
[Visual Basic] Public Class ContextualTabGroupCollection Inherits System.Collections.Generic.List(Of ContextualTabGroup)