artwork problem while changing background color of liquid canvas

i am trying to fill the background color in liquid canvas component  as
below  but it didn't work out .Result is no background color/canvas with a
error in
firefox that says unknown pugin .

Graphics g=new Shadow();
        g.setChainedGraphics(new Border()).setChainedGraphics(new
Gradient());
        Fill fill=new Fill("#ADDFFF");
        LiquidCanvasBehavior lcb=new LiquidCanvasBehavior(fill,g,new
RoundedRect());

regards,
Vineet Semwal