/** * @return Form itself */ function addButton($name, $label, $callback = null) { if (is_string($callback)) { Assert::isTrue(method_exists($this, $callback), 'unknown method %s::%s', get_class($this), $callback); $callback = array($this, $callback); } $this->addControl(FormControl::button($name, $label)); $this->buttons[$name] = $callback; return $this; }