Help with simple CheckBox example

[ds26680]

I am new to creating web applications with Wicket and I am struggling with
getting a CheckBox to set a boolean variable in my domain object using a
PropertyModel. 

I have had a good search around on the web for examples and I think the code
bellow should work just fine. However when I click the submit button on my
form (after checking the checkbox), the domain model is not updated and the
print line in the onSubmit method always returns false. 

I have watched this code in the debugger and the setSelected method (in
domain class) never gets called.  Does anyone have an idea why the code
bellow should not work? 

I have created the following Java code for the view:-

    public HomePage() {

        MyForm form = new MyForm("form");
        add(form);
    }

    private class MyForm extends Form {

        private CheckBoxModel checkBoxModel = new CheckBoxModel();
        
        public MyForm(String s) {
            super(s);

            CheckBox myCheckBox = new CheckBox("selected",
                    new PropertyModel(checkBoxModel, "selected"));
            add(myCheckBox);
        }
    
        protected void onSubmit() {
            boolean bool = checkBoxModel.getSelected();

            // I expect this to print true when check box has been clicked
            System.out.println(bool);
        }
    }

My domain class is as follows:-

   public class CheckBoxModel {

        private boolean selected;

        public boolean getSelected() {
             return selected;
        }

        public void setSelected(boolean selected) {
             this.selected = selected;
        }

        public String toString() {
             return String.valueOf(selected);
        }
   }
  
Thanks in advance for your help.
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