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class InternalForm<T> extends Form<T> implements IFormVisitorParticipant {
    public InternalForm(String name) {
        super(name);
    }

    public InternalForm(String name, IModel<T> model) {
        super(name, model);
    }

    public boolean processChildren() {
        IFormSubmittingComponent submitter = getRootForm().findSubmittingButton();
        if (submitter == null)
            return truefalse;
        
        return submitter.getForm() == this;
    }
}

Form nestedForm = new InternalForm("nestedForm");