The WM_NCACTIVATE message is sent to a window when its nonclient area needs to be changed to indicate an active or inactive state.
WM_NCACTIVATE fActive = (BOOL) wParam; // new state of the title bar or icon
When the fActive parameter is FALSE, an application should return TRUE to indicate that Windows should proceed with the default processing, or it should return FALSE to prevent the title bar or icon from being deactivated. When fActive is TRUE, the return value is ignored.
The DefWindowProc function draws the title bar or icon title in its active colors when the fActive parameter is TRUE and in its inactive colors when fActive is FALSE.
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