Formless DropDownChoice selected value is null

[bebetu]

Hi,
I have a DropDownChoice in a WizardStep component (Wicket 1.3 beta 3) and I
want to read the selected value then update a text label based on selection
as well as disable the "Next" button if the user hasn't made a selection.
First of all I cannot get the selected value when I run the code below, the
selectedChoice variable is always null. 
Secondly, how to ajaxify the "Next" wizard button based on the selection?
What am I doing wrong?

final ValueMap choiceMap = new ValueMap();
final PropertyModel ddcModel = new PropertyModel(choiceMap,
"selectedOption");
final DropDownChoice ddChoice = new DropDownChoice("choiceId", ddcModel,
someOptionList);
ddChoice.add(new AjaxEventBehavior("onchange") {
                                @Override
                    protected void onEvent(AjaxRequestTarget target) {
                           Object selectedChoice =
choiceMap.get("selectedOption");

                    }
});

Thanks!
florin
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