code: @Override
  	public void doRender(final WComponent component, final WebXmlRenderContext renderContext) {
  		WCollapsibleToggle toggle = (WCollapsibleToggle) component;
  		XmlStringBuilder xml = renderContext.getWriter();
  
  		xml.appendTagOpen("ui:collapsibletoggle");
  		xml.appendAttribute("id", component.getId());
  		xml.appendOptionalAttribute("class", component.getHtmlClass());
  		xml.appendOptionalAttribute("track", component.isTracking(), "true");
  		xml.appendAttribute("groupName", toggle.getGroupName());
  		xml.appendEnd();
  	}
docs: Paints the given WCollapsibleToggle.
  
  @param component the WCollapsibleToggle to paint.
  @param renderContext the RenderContext to paint to.