In order to get the CustomGridLines over all 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.
Unfortunately currently it is not possible to have the annotations over some of the series and below others. Please excuse us for the inconvenience caused.
the Telerik team
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