title: KendoUI - Cascade Issue
body: <p>I'm trying to do a simple code of taking Country -> State -> City. Can somebody tell me what's the issue in this case? The countries list load fine but after selecting the country, the states don't get loaded, nor is the event fired.</p>
  
  <pre><code>&lt;script&gt;
          var country = $('#inputCountry option:selected').val();
          $(document).ready(function(){
              var countries = $("#country").kendoComboBox({
                  autoBind:false,
                  placeholder: "Select Country",
                  dataTextField: "countryName",
                  suggest:true,
                  dataValueField: "geonameId",
                  dataSource: {
                      transport: {
                          dataType: "json",
                          read: {
                              url: "http://api.geonames.org/countryInfoJSON",
                              data: {
                                  username: "kirobo"
                              },
                              cache:false,
                          }
                      },
  
                      schema : {
                          model: {
                              children: "geonames"
                          },
                          data: function(response) {
                              return response.geonames;
                          }
                      }
                  }
              }).data("kendoComboBox");
              var state = $("#state").kendoComboBox({
                  autoBind: false,
                  suggest: true,
                  cascadeFrom: "country",
                  placeholder: "Select State",
                  dataTextField: "name",
                  dataValueField: "geonameId",
                  dataSource: {
                      transport: {
                          dataType: "json",
                          read: {
                              url: "http://api.geonames.org/childrenJSON",
                              data: {
                                      username: "kirobo",
                                      geonameId: getCountry()
                                  },
                              cache:false,
  
                          },
                          parameterMap: function(data, type) {
                              return {
                                  username: "kirobo",
                                  geonameId: getCountry()
                              }
                          }
  
                      },
                      cache:false,
                      schema : {
                          data: function(response) {
                              return response.geonames;
                          }
                      }
                  }
              }).data("kendoComboBox");
              var cities = $("#city").kendoComboBox({
                  suggest:true,
                  autoBind: false,
                  cascadeFrom: "state",
                  placeholder: "Select City",
                  dataTextField: "name",
                  dataValueField: "geonameId",
                  dataSource: {
                      serverFiltering: true,
                      transport: {
                          dataType: "json",
                          read: {
                              url: "http://api.geonames.org/childrenJSON",
                              data: {
                                  username: "kirobo",
                                  geonameId: getState()
                              },
                              cache:false,
  
                          },
                          parameterMap: function(data, type) {
  
                              return {
                                  username: "kirobo",
                                  geonameId: getState()
                              }
                          }
  
                      },
  
                      schema : {
  
                          data: function(response) {
                              return response.geonames;
                          }
                      }
                  }
              }).data("kendoComboBox");
              function getCountry() {
                  var combo = $("#country").data("kendoComboBox");
                  return combo.value();
              }
  
              function getState() {
                  var combo = $("#state").data("kendoComboBox");
                  return combo.value();
              }
          });
  
  
      &lt;/script&gt;
  </code></pre>