def check_colors
        each_column {|c,i|
          if c.color || c.bgcolor || c.attrib
            @_check_coloring = true
            return
          end
          @_check_coloring = false
        }
      end
def check_colors
        each_column {|c,i|
          if c.color || c.bgcolor || c.attrib
            @_check_coloring = true
            return
          end
          @_check_coloring = false
        }
      end
check if we need to individually color columns or we can do the entire
 row in one shot