Dojo堆叠柱状图问题在堆叠的顶部添加总堆叠值

我的dojo堆叠柱状图似乎有问题。每个堆栈值都被放置在堆叠图表的"内部"。但我希望这些叠加的总数应该在顶部，但在图表之外，就在x轴标签之上。那么我如何实现堆栈总数显示在堆叠列的顶部。这是我的网站链接。这里我需要在栏的顶部显示我的总堆叠值，以及每个堆叠值的工具提示。

我的代码是

    require(["dojox/charting/Chart", 
      "dojox/charting/plot2d/Lines", 
   "dojox/charting/axis2d/Default", 
   "dojox/charting/plot2d/StackedColumns",
   "dojox/charting/action2d/Tooltip",
   "dojo/ready", 
   "dojox/charting/widget/SelectableLegend"],
   function(Chart, Lines, Default, StackedColumns, Tooltip, ready, SelectableLegend) {
ready(function() {
    var chart1 = new Chart("chart1");
    chart1.title = "stacked chart";
    chart1.addPlot("stackedColumnsPlot", {
        type: StackedColumns,
        gap:6,
        lines: true,
        areas: true,
        markers: true,
        labels: true,
        labelStyle:"inside",
        //maxBarSize: 35,
        tension: "2"
    });
chart1.addAxis("x", {  
                      dropLabels: false,
                      labelSizeChange: true,
                      rotation:-20,
                      majorTicks:true,
                      majorTickStep:1,
                      minorTicks:false,
                      font: "normal normal bold 12px Tahoma", 
                      fontColor: "black",
                     labels: [{"value":1,"text":"A"},{"value":2,"text":"B"},{"value":3,"text":"C"},{"value":4,"text":"D"},{"value":5,"text":"E"},{"value":6,"text":"F"}] 
});
    chart1.addAxis("y", {title:"Cost",
      fixLower: "major",
      fixUpper: "major", 
       includeZero: true,
      majorTickStep:500,
     max: 1500,
     //from:1000,
     //to:6000,
        vertical: true
    });
    chart1.addSeries("AC",[300,500,500,600,300,280] ,
     {
        plot: "stackedColumnsPlot",
        stroke: {
            color: "#FFFFFF" ,
        },
        fill: "#FFAEAE "
    });
    chart1.addSeries("TV", [244,301,699,620,820,837], {
        plot: "stackedColumnsPlot",
        stroke: {
            color: "#FFFFFF"
        },
        fill: "#FFEC94"
    });
    chart1.addSeries("ACCE", [500,100,100,100,200,250] , {
        plot: "stackedColumnsPlot",
        stroke: {
            color: "#FFFFFF"
        },
        fill: "#B4D8E7"
    });
    chart1.addSeries("OTHER", [100,150,100,700,700,0,800,300,300] , {
        plot: "stackedColumnsPlot",
        stroke: {
            color: "#FFFFFF"
        },
        fill: "#56BAEC"
    });
   new Tooltip(chart1, "stackedColumnsPlot", {
        text: function(chartItem) {
            console.debug(chartItem);
        //return "Rating: " + chartItem.run.data[chartItem.index] + "; Total Value: " + chartItem.y;
          // return  "Comparision Rating: " + chartItem.y;
           return "Value: " + chartItem.run.data[chartItem.index] + "; Stacked Value: " + chartItem.y;
        }
    }); 
    chart1.render();
    new SelectableLegend({
        chart: chart1,
        horizontal: true,
        align:top
    }, "chart1SelectableLegend");
   });
  });

根据我的经验，当我有一个第一个值为300的序列和另一个第一个值为244的序列时，工具提示显示静态序列名称value: 300和value: 244。悬停在这些系列上时。我希望它仍然显示AC: 300和TV: 244，总堆叠值显示在堆叠的顶部为total: 544。但我无法得到这种类型的价值。谢谢你的帮助。