Currently our ChartView control doesn't support Annotations (Marked Zones, custom gridlines or custom lines). However this is in our near future development plans.
As a workaround I suggest that you use the striplines of the Cartesian chart. You may find them described in this
help topic. Please note that you may add as many Y stripe brushes as you want to imitate a rectangular background area i.e. marked zone.
All the best,
the Telerik team
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