Show Popup Window
The DevExpress MVC Popup Extension has a capability to load the content of popup windows on demand. Several content loading modes are available via the following settings of the LoadContentViaCallback property.
Using the postponed load of popup window contents, you can enhance the response time of your web page on its initial load
Note that in this example we purposely pause callback processing on the server side for a second in order to make the Loading Panel visible during this time.