Hello Mits,

Thank you for posting in our forums.

Do you want to fetch the data at the moment of the button click?

You can set the initial WindowState = Hidden of the WebDialogWindow

http://help.infragistics.com/NetAdvantage/ASPNET/2011.2?page=WebDialogWindow_Display_the_Dialog_Window.html

Inside the ContentPage of the WDW you can add WebDataGrid and bind the DB data rows to it

Inside the click handler you can change the state to Normal and set the dataSource of the WDG.

Let me know if you need further assistance