Charts - emphasize grid line at 0

[seth.horrigan]

Short of creating my own sprite on the chart surface and then drawing a path with that sprite, is there some way to emphasize the grid line at 0 in a chart that has negative and positive values on a Numeric axis?


None of the chart examples seem to have negative values, so they are of little help in this regard.

[mitchellsimoens]

You may be able to make a theme to do this.