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We have a simple Form that contains two submit buttons. The class contructor looks something like this:

    public CustomForm(String form) {
        add(new OkayButton());
        Button cancel = new CancelButton();
        cancel.setDefaultFormProcessing(false);
        add(cancel);
    }

Note: without setDefaultFormProcessing(false), the "cancel" button is subject to validation like the "Ok" button.

The we have two custom Button classes with the override onSubmit() that looks something like below:

    //This method is in OkayButton class
    public void onSubmit() {
      //what to do when this "Ok" button is click
      log.info("Ok button pressed");
    }

    //This method is in CancelButton class
    public void onSubmit() {
      //Do the "Cancel" thing when click
      log.info("Cancel button pressed");
    }

Alternatively, this can also be done with anonymous inner classes, e.g.

    private static class MyForm extends Form {
        public MyForm(String name) {
            super(name);
            add(new Button("okbutton"){
                protected void onSubmit() {
                    info("OK was pressed!");
                }
            });
            Button cancel = new Button("cancelbutton"){
                protected void onSubmit() {
                    info("Cancel was pressed!");
                }
            };
            cancel.setDefaultFormProcessing(false);
            add(cancel);
        }
    }

with the HTML being

  <form 

...>

      <input type="submit" wicket:id="okbutton value="OK" />

      <input type="submit" wicket:id="cancelbutton value="Cancel" />

  </form>