title	Windows Support Classes (ATL) | Microsoft Docs
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Windows Support Classes

The following classes provide support for windows:

• _U_MENUorID Provides wrappers for CreateWindow and CreateWindowEx.

• CWindow Contains methods for manipulating a window. CWindow is the base class for CWindowImpl, CDialogImpl, and CContainedWindow.

• CWindowImpl Implements a window based on a new window class. Also allows you to subclass or superclass the window.

• CDialogImpl Implements a dialog box.

• CAxDialogImpl Implements a dialog box (modal or modeless) that hosts ActiveX controls.

• CSimpleDialog Implements a dialog box (modal or modeless) with basic functionality.

• CAxWindow Manipulates a window that hosts an ActiveX control.

• CAxWindow2T Provides methods for manipulating a window that hosts an ActiveX control and also has support for hosting licensed ActiveX controls.

• CContainedWindowT Implements a window contained within another object.

• CWndClassInfo Manages the information of a new window class.

• CDynamicChain Supports dynamic chaining of message maps.

• CMessageMap Allows an object to expose its message maps to other objects.

• CWinTraits Provides a simple method of standardizing the traits of an ATL window object.

• CWinTraitsOR Provides default values for window styles and extended styles used to create a window. These values are added, using the logical-OR operator, to values provided during the creation of a window.

Related Articles

ATL Window Classes

ATL Tutorial

See Also

Class Overview
Message Map Macros
Window Class Macros