Registering custom symbol renderer provider

     /**
    * A custom renderers provider.
    */
    class RendererProvider implements PresentationElementRendererProvider
    {
        private SlotRenderer slotRenderer;
        private DependencyRenderer dependencyRenderer;
        private PackageRenderer packageRenderer;
 
        RendererProvider()
        {
            slotRenderer = new SlotRenderer(); 
            dependencyRenderer= new DependencyRenderer(); 
            packageRenderer = new PackageRenderer();
        }
 
        public PresentationElementRenderer getRenderer(PresentationElement presentationElement)
        {
            if (presentationElement instanceof SlotView || presentationElement instanceof SlotListElementView)
            {
                // A slot renderer 
                return slotRenderer;
            }
 
            if (presentationElement instanceof DependencyView)
            {
                // dependency renderer 
                return dependencyRenderer;
            }
 
            if (presentationElement instanceof PackageView)
            {
                // package renderer 
                return packageRenderer;
            }
 
            return null;
       }
    };

    PresentationElementRendererManager.getInstance().addProvider(new RendererProvider());