where is form panel documentation?

in following case:
a search screen with many searching criteria, send to servlet using
formpanel post method, then the servlet retrieve database and let us
said it retrieve the resultset and fill the data to a vector, then how
search result page get the data in vector from servlet?
Also, in
http://google-web-toolkit.googlecode.com/svn/javadoc/1.5/com/google/gwt/user/client/ui/FormPanel.html
it mentions
public void onSubmitComplete(FormSubmitCompleteEvent event) {
// When the form submission is successfully completed, this
event is
// fired. Assuming the service returned a response of type
text/html,
// we can get the result text here (see the FormPanel
documentation for
// further explanation).
Window.alert(event.getResults());
}

But I cannot found the FormPanel documentation. where is it?

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