https://www.dotnetzone.gr:443/cs/blogs/abekiaris/archive/2010/03/19/the-additionalviewcontrolsprovider-module.aspx  AdditionalViewControlsProvider is a module that it only knows how to display a given control in a given position . So one could easily define an interface for the parameters needed when this behavior is implemented as public interface IAdditionalViewControlsRuleelCommunityServer 2.1 SP3 (Build: 20423.1)