When overridden in a derived class, provides a notification callback entry point whenever the value of the Source property of an instance changes.
Assembly: PresentationCore (in PresentationCore.dll)
Changing the reported source of an event programmatically can potentially require updating the type-specific data within the event. For this reason, the method is protected virtual and is intended to be overridden by subclasses of RoutedEventArgs.
This method has no default implementation.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), 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.