The ClassStyle property is ignored if the ClassName property is not a null reference (Nothing in Visual Basic).
For more information about creating control parameters, see the CreateWindow and CreateWindowEx functions and the CREATESTRUCT structure documentation in the Windows Platform SDK reference located in the MSDN Library.
The constants used to set the Style, ExStyle, and ClassStyle properties are defined in the Winuser.h header file. This file is installed by the Platform SDK or Visual Studio.
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)