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JComboBox and separators
Thunderbird has a super-useful dropdown above the message pane for quick filtering. I wanted to implement something like that in Java for JDeveloper. There are three particular aspects of this drop down that I wanted to emulate using the Swing JComboBox control:

* It contains predefined filters separated into logical groups.
* It has a Customize... item at the end. When you select this, it invokes a dialog.
* If you navigate through the items with the keyboard while the dropdown is visible, the filters are not immediately applied. This only happens when you hit enter