1. In SQL Server, launch storage manager.
2. For any database, change the state to offline/online by using the 'Set Online' option
3. When you click 'ok' on the dialog asking you to confirm changing the state to online/offline, an error message will be generated. However, the operation itself does succeed

The reason is most likely that SQL Server is returning an informational 'warning' message but the GUI does not have a messages tab to display the message.