title: Get ID value of a dojo combobox selected item
body: <pre><code>    var xhrArgs = {
       url: "../Person/GetAll",
           handleAs: "json",
           preventCache: true,
         load: function (data, ioargs) {
              var jsonString = dojo.toJson(data)
              var dataStore = new dojo.store.Memory({ data:
              dojo.fromJson(jsonString) });
      var personCmb = dijit.byId('cmbSingers');
                          if (personCmb == null)
   {
       var cobox = new dijit.form.ComboBox({ id: "cmbSingers", name: "Name", store: dataStore, searchAttr: "Name" }, "cmbSingers");
  
                                  cobox.startup();
                              }
  
       function cmbSingers_OnSelected() {
  
                 alert(dijit.byId('cmbSingers').get('value')); **this return the Text, But I want to get Id of Select value**     
  
              }
  </code></pre>