ListSelectionEvent and Up/Down arrow buttons

Hi,
I am using JDK 1.3.1 and having a wierd problem with changing list selection using the Up and Down arrow buttons.
Normally, when changing a list or table selection using the mouse, two events will be fired in sequence. The first one is the deselect event of the old selection and the second one will be the select event of the new selection. But when I change the selection using the Up and Down arrow buttons, only the second event is fired.
I installed an extend ListSelectionListener on my DefaultListSelectionModel as following:
public void valueChanged(ListSelectionEvent e){
if (e.getValueIsAdjusting()) {
// Do something to the old selection when leaving it
else {
//Do something to the new selection
As described earlier, when changing seleciton with the mouse, the valueChanged() method will be invoked twice with the e.getValueIsAdjusting() returning true then false. But when changing the selection with a Up or Down key, the method will only be invoked once with the e.getValueIsAdjusting() returning false.
Did anyone have this problem too? Is this a JDK specific problem? Your help will be really appreciated.
Thanks very much.

If this behavior is expected for the JList, I am wondering if there is anyway that I could disable the Up/Down arrow buttons in the list box.
Thanks.

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