Hi all,

I have an Array Controller whose objects are displayed in an NSPopUpButton.
I can add and remove objects, and they refresh automatically in the box as
expected.

However, what can I do if the array controller becomes empty? If I delete
all the objects, or if the window starts up with an empty array controller,
I'd like for the list to then have a null element that says "No objects."
Once an object is added, it should go away. But if I choose "Insert null
placeholder" in the pop-up options, the null placeholder is ALWAYS there,
which is not good.

Is there a way to do this in IB, or is this a thing I should code? And if
so, how can I make sure the method is called whenever there is a change to
the array controller?

Thanks in advanced...
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