It looks like an issue in TKChart
. I confirm that this method is never called. I logged the issue and it will be addressed in our upcoming release in Q1 2015. Here is a link
to our feedback portal where you can track/vote/or comment on that issue. I updated also your Telerik points for reporting it. I hope the specified time frame is feasible for you.
Should you have other questions, do not hesitate to ask.
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