Edit in JSFiddle

require.config({
  baseUrl: "http://ibm-js.github.io/libraries/master/"
});

require(["deliteful-build/layer"], function () {
  require(["dstore/Memory", "dstore/Trackable",
           "deliteful/Combobox", "deliteful/list/List",
           "requirejs-domready/domReady!"],
    function (Memory, Trackable, ComboBox, List) {     
      var dataSource = new (Memory.createSubclass(Trackable))({});      
      dataSource.add({ label: "France", sales: 500, profit: 50, region: "EU" });
      dataSource.add({ label: "Germany", sales: 450, profit: 48, region: "EU" });
      dataSource.add({ label: "UK", sales: 700, profit: 60, region: "EU" });
      dataSource.add({ label: "USA", sales: 2000, profit: 250, region: "America" });
      dataSource.add({ label: "Canada", sales: 600, profit: 30, region: "America" });
      dataSource.add({ label: "Brazil", sales: 450, profit: 30, region: "America" });
      dataSource.add({ label: "China", sales: 500, profit: 40, region: "Asia" });
      dataSource.add({ label: "Japan", sales: 900, profit: 100, region: "Asia" });        
      var list = new List(
          {source: dataSource, righttextAttr: "sales", categoryAttr: "region"});
      var combobox = new ComboBox({list: list, selectionMode: "multiple"});
      combobox.placeAt(document.body);      
      document.body.style.display = "";
  });
});