JComboBox: Trapping selection of items

I want to select items in a non-editable JComboBox by:
a) scrolling through and selecting with the mouse;
b) scrolling through with mouse or arrow keys and hitting [return];
c) using a KeySelectionManager to find an item be entering search characters then hit [return] or click with the mouse.
(a) seems to be the default behaviour, which is fine;
(b) arrows initially caused actionEvents to be fired, until I saw the tip on this site to use putClientProperty("JComboBox.lightweightKeyboardNavigation","Lightweight") - this now seems to work OK;
(c) is the problem.
I get an event every time I enter a character to search on, but I only want to know when the user selects an item with [return] or mouse-click. How and where should I trap these events to make this happen?
Sorry if this seems like a dumb question, but I'm new to Swing and I'm having trouble figuring out where and when to do all this event-handling stuff!

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