* Brix's variant of Wicket's StatelessForm that works with PageParametersAware interface.
* Also notice that we do not update the value variable inside the onsubmit method, this
* form will submit and immediately redirect to a url with submitted form values appended
* into it to keep the url looking clean.
*/
Form<?> form = new PageParametersForm("form");
add(form);
// symbol text field
form.add(new TextField<String>("symbol", new PropertyModel(this, "symbol")));
}