A RibbonGroup can become the active item when using the keyboard to navigate the ribbon and the RibbonGroup is in a state that it may be opened to display the contents of its System.Windows.Controls.ItemsControl.Items property within a popup - that is when it is in the QuickAccessToolbar or when it is collapsed.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2