public function getColumn($key)
	{
		if (!isset($this->columns[$key])) {
			throw new DataGridColumnNotFoundException("There is no column at key [$key] defined.");
		}

		return $this->columns[$key];
	}
public function getColumn($key)
	{
		if (!isset($this->columns[$key])) {
			throw new DataGridColumnNotFoundException("There is no column at key [$key] defined.");
		}

		return $this->columns[$key];
	}
public function getColumn ( $ key ) { if ( ! isset ( $ this -> columns [ $ key ] ) ) { throw new DataGridColumnNotFoundException ( "There is no column at key [$key] defined." ) ; } return $ this -> columns [ $ key ] ; }
Return existing column
@param  string $key
@return Column\Column
@throws DataGridException
Return existing column