Hi Michail,
Generally speaking the order to of the series depends on their
definition order, however the area series cannot be plotted over the columns. The reason for such behavior is that if the area series are in front of the column series you would not be able to reach the column series (for example to show a tooltip, fire seriesHover, seriesClick etc. for the columns).
Regards,
Iliana Nikolova
Telerik
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