public function findDefaultSort()
	{
		if (!empty($this->sort)) {
			return;
		}

		if ($this->getSessionData('_grid_has_sorted')) {
			return;
		}

		if (!empty($this->default_sort)) {
			$this->sort = $this->default_sort;
		}

		$this->saveSessionData('_grid_sort', $this->sort);
	}