Hi folks.  I would like to create a class/block that has an annotation that defines icon/drawing graphics and then have subclasses/subblocks slightly modify the graphics. So for example:

block BaseGraphic
  constant Color color = {255,0,0};
  annotation
  (
       Icon
      (
        coordinateSystem
        (
          extent={{-100,-100},{100,100}},
          initialScale=0.2
        ),
        graphics=
        {
          Polygon
          (
            lineColor=color,
            fillColor=color,
            points={{-100,100},{100,0},{-100,-100}}
          )
        }
      )
  )
end BaseGraphic;

block YellowGraphic
  extends BaseGraphic(color={255,255,0});
end YellowGraphic;


When I instantiate a YellowGraphic object, the color does not change to yellow. It seems that the inherited annotation in YellowGraphic is not evaluated in the context of YellowGraphic and the color remains red. I've tried redeclaring the constant color in YellowGraphic as well with the same results.

How do I go about doing so? I really don't want to repeat what is a much more complicated graphic definition than shown in the example above in the 6 derived classes/blocks I want to define.

Thanks in advance.