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 TRUE.
Return Value
Always returns 1.
Requirements
Header: atlctl.h