fillOpacity: Number

Sets opacity of filled area in custom break.

var  chart =  new  CanvasJS.Chart("container",
{
 .
 .
 axisX: {
    scaleBreaks: {
	customBreaks: [{
            fillOpacity: .2,
	    .
	    .
        }]
    }

 },
 .
 . 
});
chart.render();