text: var DemoApp = angular.module('DemoApp', ['dx']);
  
  DemoApp.controller('DemoController', function DemoController($scope) {
      $scope.chartOptions = {
          palette: "ocean",
          dataSource: dataSource,
          type: "doughnut",
          title: { 
              text: "Imports/Exports of Goods and Services",
              subtitle: {
                  text: "(billion US$, 2012)"
              }
          },
          legend: {
              visible: true
          },
          innerRadius: 0.2,
          commonSeriesSettings: {
              label: {
                  visible: false
              }
          },
          tooltip: {
              enabled: true,
              format: "currency",
              customizeTooltip: function() {
                  return { text: this.argumentText + "<br>" + this.seriesName + ": " + this.valueText + "B" };
              }
          },
          "export": {
              enabled: true
          },
          series: [{
              name: "Export",
              argumentField: "Country",
              valueField: "Export",
          }, {
              name: "Import",
              argumentField: "Country",
              valueField: "Import"
          }]
      };
  });