Hello Ed,
I am sorry to say that currently neither RadHtmlChart not RadChart support the desired chart type. Such a feature request, however, has already been logged in our feedback portal
here, so that you can monitor, comment and vote on it. As more and more people vote on particular item its priority for implementation raises.
You can also find useful
RadHtmlChart vs. RadChart, round 2. Which one is right for me? blog post by Marin Bratanov that sheds more light on the pros and cons of both charts.
Regards,
Danail Vasilev
Telerik
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