.NET Framework (current version)
Occurs when the clock's speed is updated.
PresentationCore (in PresentationCore.dll)
public event EventHandler CurrentGlobalSpeedInvalidated
Pausing, resuming, reversing, accelerating, decelerating, seeking, stopping, or changing a clock's interactive speed using a ClockController triggers this event.
Although this event occurs when the CurrentGlobalSpeed property becomes invalid, that doesn't necessarily mean the property changed.
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Available since 3.0