How to edit an item in a JComboBox

I want the user to be able to edit an item in a combobox box. You select an item, edit in the top, press enter, and viola, the item is renamed.
I've tried some approaches but they're not working out. Thanks for any ideas. What's the point of having an editable combobox if it doesn't EDIT?!

Hi,
should be as easy as:
String[] patternExamples = {
      "dd MMMMM yyyy",
      "dd.MM.yy",
      "MM/dd/yy",
      "yyyy.MM.dd G 'at' hh:mm:ss z",
      "EEE, MMM d, ''yy",
      "h:mm a",
      "H:mm:ss:SSS",
      "K:mm a,z",
      "yyyy.MMMMM.dd GGG hh:mm aaa"
JComboBox patternList = new JComboBox(patternExamples);
patternList.setEditable(true);
patternList.addActionListener(...);

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