def parse(node)
      node.xpath('*').each do |grid_child|
        case grid_child.name
        when 'gridCol'
          @columns << GridColumn.new(parent: self).parse(grid_child)
        end
      end
      self
    end
def parse(node)
      node.xpath('*').each do |grid_child|
        case grid_child.name
        when 'gridCol'
          @columns << GridColumn.new(parent: self).parse(grid_child)
        end
      end
      self
    end
Parse TableGrid
 @param [Nokogiri::XML:Node] node with TableGrid
 @return [TableGrid] result of parsing