In order to get the CustomGridLines over the series you need to set a custom style to your chart area. The Annotation Layer needs to be added after
the Item Presenter in the DragZoomLayerControl. More information about similar approach can be found in the following help topic, p.1
. You need also to set IsHitTestVisible= false to the annotation layer.
Please try this and let us know how it works on your end.
All the best,
the Telerik team
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