The OnNotifyMessage method is called if the control's EnableNotifyMessage style bit is set in ControlStyles. The EnableNotifyMessage style in ControlStyles enables the control to be notified when the WndProc method receives a Windows message. With this method, semi-trusted controls can listen for Windows messages without enabling them to modify the message.
Notes to Inheritors
When overriding OnNotifyMessage in a derived class, calling the base class's OnNotifyMessage method is not necessary because there is no initial implementation.
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)