Can't open the "Database Diagrams" in SQL 2012 ssms

I followed the instruction and put my self and SA as owner of this database in the File property.  I refreshed, I disconnected, re-connected to DB but I still get the message attached.  I check and rechecked and I am the owner in the file property.  The SQL is local on my PC and is setup for Windows authentication only.

How to fix this?  Thank you.
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Brian CroweDatabase AdministratorCommented:
Nothing attached...what is the message?
Scott PletcherSenior DBACommented:
Maybe the q subject is supposed to be the error message (?), but it's not complete enough.
lapuccaAuthor Commented:
My apology, here is the attachment of the error message.
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Anthony PerkinsCommented:
Are you a member of the db_owner database role ?

Do you get the expected database owner name when you do this:
SELECT  name, SUSER_SNAME(owner_sid)
FROM sys.databases
WHERE name = 'yourdatabasename'

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lapuccaAuthor Commented:
I ran this and nothing is selected
SELECT  name, SUSER_SNAME(owner_sid)
FROM sys.databases
WHERE name = '[AdventureWorks2012]'

I guess just setting myself in as owner of this database in the File property isn't enough.  I look at under Security expanding that with server Roles still doesn't show db_owner database role.  Where can I find that to add myself?  Thank you.
Scott PletcherSenior DBACommented:
WHERE name = 'AdventureWorks2012'
lapuccaAuthor Commented:
Ah!  That worked.  It does select and return my name.   Then why I kept getting the error message when I click on the Database Diagram?  Thankl you
lapuccaAuthor Commented:
Never mind.  It stops giving the error message when I click on the DB Diagram.  Don't know why.
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