In MIX 09 Beta build of Silverlight 3, when we wanted to enable out-of-browser experience, we had to edit manually AppManifest.xml. Now for Silverlight 3 projects in Visual Studio 2008 we got the out of browser settings helper dialog box The dialog will be saved in “OutOfBrowserSettings.xml” and this file contents will be merged on compile time to the AppManifest.xml. For hardcore programmers, who wants to write every single piece of the application without wizards/helpers – you still could use AppManifest...