In Visual Studio, Class Designer provides a visual design surface in the form of a class diagram. You can use this design surface to design, view, and refactor classes and other types in a Visual Studio project.
Working with Classes and Other Types
Working with Class Diagrams
Designing Classes and Types
Viewing Types and Relationships on Class Diagrams
Refactoring Classes and Types
Working with Visual C++ Code in Class Designer
Class Designer Error Messages
Editing Code and Resource Files