How to create a default value for a JComboBox through his model

Hi,
I have created a "myComboBox" component.
This component extend the standard Java JComboBox and simply add some helper features.
The values that "myComboBox" display are coming from his bound model. (In fact, "myComboBox" has been designed to allow JComboBox to be implemented accordingly to the MVC design pattern: The model contains the data, the view the GUI and the controller handle the GUI events).
My question is how can I add a default "none" item to the content displayed by an instance of "myComboBox" without doing any refactoring of the existing code implementing "myComboBox" ?
Thank you very much for your help.

It sounds like what you really want is to display "None" when the selected index = -1. Simple, write a custom list cell renderer that display's something instead of nothing when the index is -1.

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Attachments:
generateWaveformFIFO.vi ‏15 KB

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{code}
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Hello,
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Data File:      mydata.dat
Bad File:     mydata.bad
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(Allow all discards)
Number to load: ALL
Number to skip: 0
Errors allowed: 50
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Continuation:    none specified
Path used:      Conventional
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0 Rows not loaded due to data errors.
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0 Rows not loaded because all fields were null.
Space allocated for bind array:                  18560 bytes(64 rows)
Read   buffer bytes: 1048576
Total logical records skipped:          0
Total logical records read:             4
Total logical records rejected:         0
Total logical records discarded:        0
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Run ended on Mon Feb 09 18:17:36 2009
Elapsed time was:     00:00:00.98
CPU time was:         00:00:00.10
{code}
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