/**
* @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;
}
