HighCharts: how to update bar color when updating the point value -

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i use "update" command refresh value of point in series:

mychart.series[0].data[i].update(sigvalue);

now update color of column/point well. tried 

mychart.series[0].data[i].color = "#ff0000";

but did not work...

color should changed attr() function.

http://jsbin.com/ubapaz/10/edit

    $('#test').click(function() { chart.series[0].data[4].graphic.attr("fill","#ff0000");     });

api here reference.


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