Visual Studio .NET presents a great deal of information about controls and other components you use in the development environment. When you drag a component from the toolbox into your project, VS.NET appears to know everything about itthe events and properties it supports are displayed in the property panel, neatly categorized, with a short description available for each member. Some controls have their own unique interactive editing features. Many add extra items to Visual Studio .NET's menus.
You might suspect that this level of extensive and often highly specialized support is something that is available only for the built-in controls, but that is not the case. Visual Studio .NET has a very open architecture for allowing components to customize the way in which they integrate with the environment.