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The event is raised by a ItemContainerGenerator to inform layouts that the items collection has changed.
Assembly: PresentationFramework (in PresentationFramework.dll)
The items collection changes when an item is either added, removed, moved, or the ItemContainerGenerator is refreshed.
Windows 8 Consumer Preview, Windows Server 8 Beta, Windows 7, Windows Server 2008 SP2, Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)