The BN_UNHILITE notification message is sent when the highlight should be removed from a button. The parent window of the button receives this notification message through the WM_COMMAND message.
BN_HILITE
BN_UNHILITE is the same as the BN_UNPUSHED notification message.
Note This notification message is provided for compatibility with applications written for 16-bit versions of Windows earlier than version 3.0. Win32-based applications should use the BS_OWNERDRAW button style and the DRAWITEMSTRUCT structure for this task.
Windows NT: Requires version 3.1 or later.
Windows: Requires Windows 95 or later.
Windows CE: Requires version 2.0 or later.
Header: Declared in winuser.h.
Buttons Overview, Button Messages, BN_HILITE, BN_UNPUSHED, DRAWITEMSTRUCT, WM_COMMAND, WM_DRAWITEM