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I have two questions about editable JComboBox.

First, I want to append new item if user input text is not included in.
Which event listener should I
perform the action?

Second, I am using a third-party JPropertyTable. It perform double
click mouse event as selecting the
next item. I think it ugly because user will forget his previous
selection. So I want to remove this event
handler. How to do it?

Please help me. Thank you in advance.