Como remover objetos de suporte de diagramação do SQL Server?

DROP PROCEDURE dbo.sp_alterdiagram;  
DROP PROCEDURE dbo.sp_creatediagram;  
DROP PROCEDURE dbo.sp_dropdiagram; 
DROP PROCEDURE dbo.sp_helpdiagramdefinition; 
DROP PROCEDURE dbo.sp_renamediagram; 
DROP PROCEDURE dbo.sp_upgraddiagrams; 
DROP PROCEDURE dbo.sp_helpdiagrams;
DROP FUNCTION dbo.fn_diagramobjects;
DROP TABLE dbo.sysdiagrams;