Search Delegate Control in SharePoint 2010

Currently I am in the process of upgrading a SharePoint 2007 Internet site to 2010. One of the things that had me stuck initially was that after I did the upgrade and created a 2010 specific master page, my search delegate control was not showing up. I finally figured out that search delegate controls must have the Web Application feature scope in order to work. For my 2007 site, it was using Site Collection level scope.