Creates a field UI overview form.
array $form: An associative array containing the structure of the form.
array $form_state: A reference to a keyed array containing the current state of the form.
array The array containing the complete form.
public function form(array $form, array &$form_state) {
// Add the validate and submit behavior.
$form['#validate'] = array(
array(
$this,
'validate',
),
);
$form['#submit'] = array(
array(
$this,
'submit',
),
);
return $form;
}