Why won't my layer re-render?

Hi,
 
   I have a custom layer that extends OMGraphicHandlerLayer.  When I initially load the layer with OMGraphics in it, the icons display just fine.  The problem occurs after the initial loading of the layer when I add new graphics to the layer.  They don't render at all.  How do I get the layer to render properly after adding new icons to i?  My Layer is below.

Thanks!


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public class MCULayer extends OMGraphicHandlerLayer{

    /**
     * A list of graphics to be painted on the map.
     */
    private OMGraphicList omgraphics;
    private OMGraphic selectedGraphic;

    public MCULayer() {
        super();
        omgraphics = new OMGraphicList();
    }

    public void addSingleGraphic(float lat, float lon){
       
        ImageIcon simpsons = new ImageIcon("C:/Temp_Images/Simpsons.png");
       
        OMScalingIcon simpsonsScalingIcon = new OMScalingIcon(lat,lon,simpsons);
       
        OMGraphic simsonAsOMGraphic = (OMGraphic) simpsonsScalingIcon;
       
        omgraphics.add(simsonAsOMGraphic);
       
    }


    @Override
    public void paint(java.awt.Graphics g) {
        omgraphics.render(g);
    }