canvasjs tooltip order

HTML

<!DOCTYPE HTML>
<html>
<head>
<script type="text/javascript">
window.onload = function () {
var chart = new CanvasJS.Chart("chartContainer", {
animationEnabled: true,
exportEnabled: true,
axisY:{
	crosshair: {
		enabled: true,
		snapToDataPoint: true
	}
},
axisX:{
	crosshair: {
		enabled: true,
		snapToDataPoint: true
	}
},
legend:{
	fontSize: 14,
	cursor: "pointer",
	verticalAlign: "bottom",
	itemclick: function (e) {
		if (typeof(e.dataSeries.visible)==="undefined"||e.dataSeries.visible)
			e.dataSeries.visible = false;
		else
			e.dataSeries.visible = true;
		e.chart.render();
	}
},
toolTip:{
	shared: true
},
data: [{
	type: "stackedColumn",
	name: "ABRUZZO",
	showInLegend: true,
	dataPoints: [{"y":4992.13,"label":"Gen"},{"y":24120.45,"label":"Feb"},{"y":27930.75,"label":"Mar"},{"y":28792.65,"label":"Apr"},{"y":52490.83,"label":"Mag"},{"y":49680.91,"label":"Giu"},{"y":1148.01,"label":"Lug"},{"y":0,"label":"Ago"},{"y":0,"label":"Set"},{"y":0,"label":"Ott"},{"y":0,"label":"Nov"},{"y":0,"label":"Dic"}]
},{
	type: "stackedColumn",
	name: "BASILICATA",
	showInLegend: true,
	dataPoints: [{"y":6998.89,"label":"Gen"},{"y":34630.7,"label":"Feb"},{"y":42572.84,"label":"Mar"},{"y":49547.02,"label":"Apr"},{"y":50478.83,"label":"Mag"},{"y":53653.13,"label":"Giu"},{"y":11507.15,"label":"Lug"},{"y":0,"label":"Ago"},{"y":0,"label":"Set"},{"y":0,"label":"Ott"},{"y":0,"label":"Nov"},{"y":0,"label":"Dic"}]
},{
	type: "stackedColumn",
	name: "CALABRIA",
	showInLegend: true,
	dataPoints: [{"y":9498.76,"label":"Gen"},{"y":47137.69,"label":"Feb"},{"y":67100.17,"label":"Mar"},{"y":67161.42,"label":"Apr"},{"y":87502.77,"label":"Mag"},{"y":81702.24,"label":"Giu"},{"y":29442.37,"label":"Lug"},{"y":0,"label":"Ago"},{"y":0,"label":"Set"},{"y":0,"label":"Ott"},{"y":0,"label":"Nov"},{"y":0,"label":"Dic"}]
},{
	type: "stackedColumn",
	name: "CAMPANIA",
	showInLegend: true,
	dataPoints:...