Cannot delete these objects because they are open in designers.
The selected database objects are currently open in a designer. If you want to delete these objects, you must close the designers and then, for each object, choose Delete on the shortcut menu.
See Also
Other Resources
How to: Delete a Database Diagram (Visual Database Tools)
How to: Delete Tables from a Database (Visual Database Tools)
How to: Delete a Stored Procedure (SQL Server Management Studio)
How to: Delete Views from Databases (Visual Database Tools)