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OK, try subscribing to IAxis.VisibleRangeChanged event, for when you either drag or zoom you chart, the VisibleRange is changed (maybe you need to have a flag indicates that chart is not updating).
Or you can inherit the RubberBandZoomModifier and ZoomPanModifier, override OnModifierMouseUp/Move and fire your own event there, then call base implementation.
Does this make sense for you?
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