.NET Framework (current version)
Gets or sets a value that indicates whether the target property's current value should be added to this animation's starting value.
PresentationCore (in PresentationCore.dll)
member IsAdditive : bool with get, set
true if the target property's current value should be added to this animation's starting value; otherwise, false. The default value is false.
If the animation has only one of its From, To, or By properties set, setting this property has no effect.
This dependency property is unusual in that the identifier field for it comes from AnimationTimeline, and is shared by various derived classes.
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Available since 3.0