Model Code: 
@Tabbed
public <TypeOfProperty> get<PropertyName>() { ... }

Default Tabbed 
<!-- div and span work also, but iframe is the default 
     to differentiate it better -->
<iframe>
As Unordered List 
    <ul>
    As Collapsible 
    new GeneratedBinding(this).addBindingInterceptor(new BindingInterceptor() {
    @Override
    public Component createTabbed(final ITabbedHtmlElement<?, ?> e) {
        if (TabbedAndPanelsConstants.asCollapsible.equals(e.getWicketId())) {
            return new ModelCollapsibleList(e);
        }
        return super.createTabbed(e);
    }
}).bind();
    As Accordion 
    new GeneratedBinding(this).addBindingInterceptor(new BindingInterceptor() {
    @Override
    public Component createTabbed(final ITabbedHtmlElement<?, ?> e) {
        if (TabbedAndPanelsConstants.asAccordion.equals(e.getWicketId())) {
            return new ModelAccordion(e);
        }
        return super.createTabbed(e);
    }
}).bind();