Tree item for MouseDownEvent

Good Afternoon,

For items in a tree how do you determine what tree item was clicked
on? I have a tree that I am using like a menu and based on the tree
item selected I would like to display a different panel. Below is the
MouseDownHandler that I am working with. How should I be determining
what list item the event was fired for?

Thanks,
Doug

tree.addMouseDownHandler(new MouseDownHandler(){
@Override
public void onMouseDown(MouseDownEvent event) {
// TODO display panel for item selected in tree
contentLabel.setText(event.getAssociatedType().toString());
sp.setWidget(contentPanel);
}});

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