GWT 1.7 using ChangeHandler on ListBox (drop-down)

Here is a simple example of how to listen to the change event.
This functionality replaces the deprecated listBox.addChangeListener(new ChangeListener(){//implementation} );

private ListBox populateLearningLanguage()

{

final ListBox listBox = new ListBox();

addLanguages(listBox);

listBox.setSelectedIndex(2);

listBox.addChangeHandler(new ChangeHandler()

{

public void onChange(ChangeEvent event)

{

int selectedIndex = listBox.getSelectedIndex();

if (selectedIndex > 0)

Window.alert("Something got selected " + listBox.getValue(selectedIndex));

}

});

return listBox;

}