创建Database Diagrams时遇到的问题

SQL2008 R2中时，Diagrams的问题
Error: 
------------------------------ 
Database diagram support objects cannot be installed because this 
database does not have a valid owner. To continue, first use the Files 
page of the Database Properties dialog box or the ALTER AUTHORIZATION 
statement to set the database owner to a valid login, then add the 
database diagram support objects. 

解决方法：
    1. 右键点击数据库，选“properties ”
    2. 点选左侧“Options”  
    3. 在'Compatibility Level' 选 'SQL Server 2005(90)' 
    4. 点选左侧“Files” 
    5. 在owner里填入 'sa' 
    6. OK