Sometimes, you'll want to display one dialog or another depending on choices that the user has made up to that point. For example, suppose we ask them whether they want to install a new SQL Server database or use an existing one. Depending on their decision, the next screen they see will either be one that asks for details about the new database or a screen that asks them to specify where the existing database can be found. In this recipe, we'll insert such a dialog and change which dialog to show next depending on the choice the user makes.