anychart.onDocumentReady(function () {
var chart = anychart.waterfall([
{x: 'Start', value: 166},
{x: 'January', value: 43},
{x: 'February', value: -79},
{x: 'March', value: -46},
{x: 'End', isTotal: true}
var series = chart.getSeries(0);
series.fallingFill(function () {
return anychart.color.darken(this.sourceColor);
chart.title('Set falling fill parameter as a function');
chart.container('container');