In order to recreate the UI experience found in an existing Access forms Db I was porting to ASP.NET, I really wanted to use popup forms when the user clicked on a list of available items. Each item was unique and I would dynamically load an user control into a placeholder on teh child form based on what item criteria was passed to it (in a query string). On the parent form, the list of items would toggle between either "Edit" Or "Add" depending on whether the container object for the items already ......