NSView and focus

FROM : Stéphane BARON
DATE : Sat Apr 16 19:34:58 2005

i want to detect when a custom NSView lost the focus.

I have an NSView which as much as possible mimic the way the address 
book word.

in fact there is 2 differents NSView in a window: one white and one 
colored

if i want to display the info for a record i use the white view in 
the main window
using [myPrimaryView addSubView:whiteView]

if i want to modify the info for a record i use the colored view in 
the main window
using [myPrimaryView addSubView:ColorView]

the record is selected from a tableView in the main window.

to add a record i click a button addElement
to modify i click a buton modify

to save the new record or the modification to the record i click the 
modify button as in address book , the button behavior is push on / 
push off

my problem is that i want to detect if a user quit the modifying 
state without clicking on the modify button to save the change.

i want to know when the custom colored view lost the focus to:

save automatically the modifications
or
refuse to resign as first responder to keep the focus and force the 
user to save changes.

i have tryed to use setRefusesFirstResponde:YES for the other element 
of the window
or to subclass resignFirstResponder in the custom view to detect when 
the view lost focus but nothing work

As anybody have an idea ???

thanks in advance for any suggestion

S.Baron