/**
* Add a button
* @param string $value the button caption
* @param string $style one of "btn-default","btn-primary","btn-success","btn-info","btn-warning","btn-danger"
* @return HtmlButton
*/
public function addButton($value = "Okay", $style = "btn-primary")
{
$btn = new HtmlButton($this->identifier . "-" . $value);
$btn->setStyle($style);
$btn->setValue($value);
$this->buttons[] = $btn;
return $btn;
}
