title: Extjs 4.1 in MVC client controller success method can't call another function in this controller
body: <p>I am working with grails 2.1.0 and extjs 4.1.0 . Now I am facing some problem here with the success method. The problem is in the code below in comment. Can anyone help me on this : </p>
  
  <pre><code> onupdateOrder : function(invoiceid, payMethod, rebatevalue){        
      if(invoiceid &gt; 0){
          Ext.Msg.confirm('Update Product', 'Are you sure?', function (button) {
              if (button == 'yes') { 
                  var invoice = Ext.create('Ext4Example.model.Invoice',{
                      id        : invoiceid,
                      rebate    : rebatevalue,
                      paymethod : payMethod
                  });
  
                  invoice.save({
                      success: function(model) {
                          var inId = model.getId();
                          this.updateOrder(invoiceid); //warning:this.updateOrder is not a function 
                      },
                      failure: function(){                           
                          console.log('Unable to save/update');
                      }
                  });
              }
          }, this);
      }else{
          Ext.Msg.alert("Please Give Invoice Id");
      }
  },
  updateOrder :function(invoiceid){         
      var order = Ext.create('Ext4Example.model.Order',{
          id  : invoiceid
      });
      order.save({
          success: function(order) {
              console.log(invoiceid);
              Ext.getCmp('InvoiceNo').setValue(invoiceid);
              Ext.getCmp('itemform2').restoreItem();
          },
          failure: function(){
              console.log('Unable to update');
          }
      });
  }
  </code></pre>