We don’t have a HorizontalSliceModifier, or the ability to show tooltips on horizontal lines like the VerticalSliceModifier. I can add it as a feature request.
May I point you in the direction of our Custom ChartModifier API documentation though. Here you will find loads of examples on creating custom modifiers. Of particular interest is Custom ChartModifiers – Part 1 – Creating a Custom Rollover Modifier.
This shows you how the RolloverModifier works internally, drawing a vertical line on the chart, and intercepting all series to show tooltips. Maybe you can adapt this for your needs?
If you do find a solution, please feel free to post it here, as other users will benefit from it!
Thanks and regards,
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