I have a BaseForm which a bunch of other forms inherit from.  On the base form, I am referencing a Help dll which in turn references a HelpDB BO that uses a HelpDB DataSourceKey.  I can build and view the Base form just fine, but when I go to open and view the inherited forms I get DataSourceKey [HelpDB] not defined. I've commented out all code that uses the Help reference, but still get the error.  When I remove the Help reference completely it goes away.  How am I still getting this error even when I don't have code that uses the reference?