Flashing message while replacing a DataWindow object

The message “DataWindow object goes here” sometimes displays in a Web Forms application if the application replaces one DataWindow object with another, or if application users navigate to a different page of data in a current DataWindow object. This message displays briefly, just prior to the rendering of the new DataWindow object or page, but only when AJAX is enabled. If you do not want this message to display, you can change the PBPostbackType global property to "Synchronous" after you deploy your application. [CR 489283]