http://blogs.msdn.com/arash/archive/2007/11/28/extending_2D00_crm_2D00_forms_2D00_with_2D00_managed_2D00_code_2D00_using_2D00_silverlight_2D00_1_2D00_1.aspxCheck this out: http://blog.arash.cc/post/Adding-client-side-business-logic-to-CRM-forms-using-Silverlight-managed-code.aspxen-USCommunityServer 2.1 SP1 (Build: 61025.2)