def color=(v)
        @color = v if v.is_a? Color
        self.color.rgb = v if v.is_a? String
        @color
      end
def color=(v)
        @color = v if v.is_a? Color
        self.color.rgb = v if v.is_a? String
        @color
      end
Sets the color for the data bars.
 @param [Color|String] v The color object, or rgb string value to apply