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Gets or sets a method that enables you to provide custom selection logic for a GroupStyle to apply to each group in a collection.
Assembly: PresentationFramework (in PresentationFramework.dll)
Metadata properties set to true
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)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.