code: private void renderChildren(final WPanel panel, final WebXmlRenderContext renderContext) {
  		LayoutManager layout = panel.getLayout();
  		Renderer layoutRenderer = null;
  
  		if (layout != null) {
  			layoutRenderer = new RendererFactoryImpl().getRenderer(layout.getClass());
  		}
  
  		if (layoutRenderer == null) {
  			renderContext.getWriter().appendTag("ui:content");
  			paintChildren(panel, renderContext);
  			renderContext.getWriter().appendEndTag("ui:content");
  		} else {
  			layoutRenderer.render(panel, renderContext);
  		}
  	}
docs: Paints the children contained within the panel. This defers rendering to a layout renderer (if available).
  
  @param panel the panel to paint.
  @param renderContext the RenderContext to paint to.