public function addFilterSelect($key, $name, array $options, $column = null)
	{
		$column = $column ?: $key;

		if (!is_string($column)) {
			throw new DataGridException('Filter Select can only filter in one column.');
		}

		$this->addFilterCheck($key);

		return $this->filters[$key] = new Filter\FilterSelect($this, $key, $name, $options, $column);
	}