great! the trackers in WPF and Silverlight are separate controls on top of the plot control. This makes it possible to show/hide the tracker without refreshing the plot control. The Windows forms project has a tracker implemented by a simple label, I would suggest a similar approach for the Xamarin ports. This should be implemented in the Plot controls (I think the iOS version currently does not have a custom plot control, but this should be fixed) and not by events.
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