JComboBox: Telling difference if model update or actual select.

Hi again.
I got a problem with the action/itemlistener of a JCombobox.
Is there a way to tell the difference if the model was updated via addElement or an item was selected?
The ActionCommand of both is the same.
Problem is, i update the comboboxmodel via a swingworker so no way to know when it is updating.
Any ideas?

Remove the listener

Update the model

Add the listener

That is a rather blunt way to do it. I thought that there might be a better way to it.
But if thats not the case I think i will implement that.

If you prefer:

Set a boolean flag

Update the model

Reset the flag

In the listener, test the flag