PaperFabElement Click Listener

Hello, First of all sorry for my bad English.
I’m new on Vaadin Element Polymer.
While following a tutorial, I’m confused about add click listener into PaperFabElement Element UI.
I’m follow this tutorial
http://www.gwtproject.org/doc/latest/polymer-tutorial/elements-applogic.html
on this command part :

public Main() {
initWidget(ourUiBinder.createAndBindUi(this));

addButton.addEventListener(“click”, new EventListener() {
@Override
public void handleEvent(Event event) {
addItemDialog.open();
}
});
}

I’m already declare
@UiField PaperFabElement addButton
but why click listener command not working ?