Event handling and swapping panels

[Jeffrey Schneller]

I want to swap panels using the event model in 1.5.  This is very similar to 
the panel swapping code (wicket 1.4.x)  found in the Apache Wicket Cookbook but 
uses the event model instead.  The problem is I can't set the panel equal to 
its replacement, like you would in 1.4.x.  This is found on the line marked 
***** THIS IS NOT POSSIBLE *****.

How would you go about doing this?  Is it even possible?

Component workingPanel = new MyEmptyPanel("workingPanel") {
                @Override
                public void onEvent(IEvent<?> event) {
                                                if (event.getPayload() 
instanceof MyPanelEvent) {
                                                                MyPanelEvent e 
= (MyPanelEvent) event.getPayload();

                                                Component replacement;
                                                                switch 
(e.getType()) {

                                                                case 
MyPanelEvent.PANEL1:
                                                                                
replacement = new MyFirstPanel(this.getId());
                                                                break;
                                                default:
                                                                replacement = 
this;
                                                                break;
                                                                }
                                                this.replaceWith(replacement);
                                                this. = replacement;            
           // ****** THIS IS NOT POSSIBLE - HOW WOULD I DO THIS *******
                                                this.setOutputMarkupId(true);
                                                AjaxRequestTarget target = 
e.getTarget();
                                                target.add(this);
                                }
                                super.onEvent(event);
                }
workingPanel.setOutputMarkupId(true);
add(workingPanel);

AjaxLink firsttab = new AjaxLink("firsttab") {
                @Override
                public void onClick(AjaxRequestTarget target) {
                                send(getPage(), Broadcast.BREADTH, new 
MyPanelEvent (target, MyPanelEvent.PANEL1));
                }
};
firsttab.setOutputMarkupId(true);
firsttab.setMarkupId("firsttab ");
add(firsttab);