How to handle click event on listBox

I have two listboxs. And I want to load The items into the second accordingly to the selected items in the first.And I want that the content of the second change each time the selected items of the first listbox are modified.
I don't know which event to handle for the first listBox indicating the items are selected in the first listbox. I want to execute the method loading items into the second listbox each time this event is fired.
Thanks in advance.

Thanks for your reply.
I used <webuijsf:listbox > component to display the list and .
And I want to allow user to select multiple items.
Then I want that the 2nd will be populated each time an item is selected.So the method doing it must be called in an action listener .
Please I don't really know how to use the <h:selectOneMenu> component.And I want that after the submit the 2nd list will be populated.
How can I do it please.
Thanks.

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How to handle click event on listBox

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