## KILLFOCUS_CB

Action generated when an element loses keyboard focus. This callback is called before the GETFOCUS_CB of the element that gets the focus.

### Callback

    int function(Ihandle *ih); [in C]
    ih:killfocus_cb() -> (ret: number) [in Lua]

ih: identifier of the element that activated the event.

### Affects

All elements with user interaction, except menus.

In Windows, there are restrictions when using this callback. From MSDN on WM_KILLFOCUS: "“While processing this message, do not make any function calls that display or activate a window. This causes the thread to yield control and can cause the application to stop responding to messages.”

### See Also

GETFOCUS_CB, IupGetFocus, IupSetFocus