title: Extjs ComboBox setValue
body: <p>I've a combobox (e.g. change owner). When a user selects a value of the combobox, I prompt user if he is sure to change owner. If he clicks on 'Yes', I update the record in database. All works fine till this point.</p>
  
  <p>Now, if the user selects a value and clicks 'No' on prompt (after selecting value from combo). The combo retains the new value and does not bring it back to the old value. I tried setValue/Load etc but none is setting back the old value on the click on No.</p>
  
  <p>My Code looks like this</p>
  
  <pre><code>        combo = new Ext.form.ComboBox({
                          store: storeJson,
                          xtype: 'combo',
                          displayField:'name',
                          valueField: 'id',
                          mode: 'local',
                          id: 'privateTo',
                          name: 'privateTo',
                          typeAhead: false,
                          triggerAction: 'all',
                          lazyRender: true,
                          editable:false,
                          listeners: {select: changeOwner}
                      }); 
  
  var changeOwner = function(combo, record, index) {              
  
              Ext.MessageBox.confirm("Change Owner","Are you sure you want to change owner?",function(btn){
              if (btn == "yes") {
                  Ext.Ajax.request({
                     url: 'somUrl',
                     method: 'PATCH',
                     success: function(result, request) { 
                          msg('Owner changed', 'Owner changed');
                     },
                     failure: function(result, request) { 
                          Ext.MessageBox.alert('Error', "Unable to change owner");
                          Ext.getCmp("customizationGrid").getStore().reload();
                     }
                  });
              } else {
                  var d = Ext.getCmp('customizationGrid').getSelectionModel().selection;
                  var rec = combo.store.getById(d.record.json.privateTo);
                  Ext.getCmp("privateTo").setValue(rec.data.name);
  
              }
              });
          }
  </code></pre>