DECLARE_WND_CLASS_EX
Visual Studio 2012
Allows you to specify the name of an existing window class on which a new window class will be based. Place this macro in an ATL ActiveX control's control class.
DECLARE_WND_CLASS_EX( WndClassName, style, bkgnd )
This macro allows you to specify the class parameters of a new window class, whose information will be managed by CWndClassInfo. DECLARE_WND_CLASS_EX defines the new window class by implementing the following static function:
static CWndClassInfo& GetWndClassInfo();
If you want to use the default styles and background color, use the DECLARE_WND_CLASS macro. For more information about using windows in ATL, see the article ATL Window Classes.
