Modifying Candlestick Fill Colors with setOption()

[T. Mack Brown]

How does one modify the fill color of a candlestick with setOption()? 

Here's the context in which I'd like to add the fill-modifying code:

      var chart = graphsSheet.getCharts()[0];

      chart = chart.modify()

          .setOption('title', "District Representation at Session #" + sessionNumber + ": Projected and Actual")

          .setOption('colors', ["black"])

          .build();

      graphsSheet.updateChart(chart);

I've tried variations of the following statement to no avail:

        .setOption('candlestick.risingColor.fill', ["blue"])

I'd appreciate your advice.