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 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003
The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.