public function createDefaultButtons()
	{
		$this->setButtonOneLeft(new DualListButton("&#60;--", DualListButtonType::Button));
		$this->setButtonAllLeft(new DualListButton("&#60;&#60;&#60;", DualListButtonType::Button));
		$this->setButtonOneRight(new DualListButton("--&#62;", DualListButtonType::Button));
		$this->setButtonAllRight(new DualListButton("&#62;&#62;&#62;", DualListButtonType::Button));
	}