Documentation for @UiHandler

I started to look into using GWT in combination with UiBuilder. I'm a bit puzzled about how you can use the @UiHandler(..) directive to make simple event handle code as written down in the GWT documentation:

@UiHandler("button")
void handleClick(ClickEvent e) {
  Window.alert("Hello, AJAX");
}

In this case the method handleClick is used. How do you know for each GWT widget what methods can be created with @UiHandler? For some you can also create a doClose() method.

But what can you use with, for instance, a ListBox to get an event an item is selected? Where in the documentation can I see this?