public function findDefaultFilter()
	{
		if (!empty($this->filter)) {
			return;
		}

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

		if (!empty($this->default_filter)) {
			$this->filter = $this->default_filter;
		}

		foreach ($this->filter as $key => $value) {
			$this->saveSessionData($key, $value);
		}
	}