Why is stateless from making my page stateful?

[Mike Mander]

Hi,

i use a page with a border. I add a panel with a stateless form to the 
border and the page gets stateful. Why?
The symtoms are - NotSerializableExceptions and RuntimeException if i 
click the submit.
Form action: 
../../../../Overview.html/gdw_exact/Party/of/47/wicket:interface/:0:ambiance:search:searchSlot::IFormSubmitListener::

I'm definitly doing something stupid, but i can't see what. Maybe 
someone can point me to a doc or something.

Thanks
Mike

ShopBorder.java
<code>
public class ShopBorder extends Border {

    public ShopBorder(String id) {
        super(id);
        add(searchSlot());
    }

    private Component searchSlot() {
        return new SearchSlot("search") {
            @Override
            protected void setSearchterm(String searchterm) {
                getPage().getPageParameters().put("sTerm", searchterm);
                setResponsePage(getPage().getClass(), 
getPage().getPageParameters());
            };
        };
    }
}
</code>

SearchSlot.java
<code>
public abstract class SearchSlot extends Panel {

    public SearchSlot(String id) {
        super(id);
        IModel<String> term = new Model<String>();
        StatelessForm<String> form = new 
StatelessForm<String>("searchSlot", term) {
            @Override
            protected void onSubmit() {
                setSearchterm(getModelObject());
                super.onSubmit();
            }
        };
        form.add(new TextField<String>("searchTerm", term));
        form.add(new ImageButton("doSearch", new 
CompressedResourceReference(WicketApplication.class, "res/img/go.png")));
        add(form);
    }

    protected abstract void setSearchterm(String searchterm);
}
</code>

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