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Checks that the control is in-place active and has a valid control site, then informs the container that the control has lost focus.
LRESULT OnKillFocus(
   UINT /* nMsg */,
   WPARAM /* wParam */,
   LPARAM /* lParam */,
   BOOL& bHandled 
);
Parameters
- nMsg 
 Reserved.
- wParam 
 Reserved.
- lParam 
 Reserved.
- bHandled 
 Flag that indicates whether the window message was successfully handled. The default is FALSE.
Return Value
Always returns 1.
Requirements
Header: atlctl.h