Microsoft SQL Server 2005: Property Owner is not available for Database xxxxx

I restored a backup over a fresh MS SQl 2005 instance recently.
I tried to open the properties dialog from the Management Studio/Object Explorer for the restored database and got the following message

Property Owner is not available for Database 'db_name'. This property may not exist for this object, or may not be retrievable due to insufficient access rights. (Microsoft.SqlServer.Smo)

Fortunately, I solved my problem by executing the following query against the restored database:

sp_changedbowner sa