AbstractBehavior problem after comonent re-render

[Artur W.]

Hi!

I added simple simple behavior:

public class XDateField extends DateTextField {

    public XDateField(String id, IModel model) {
        super(id, model, "yyyy-MM-dd");

        add(new AbstractBehavior() {
            @Override
            public void onRendered(Component component) {
                Response response = component.getResponse();
                response.write("\n<a href=\"#\" onclick=\"changeDate('" +
component.getMarkupId() + "', -1)\">(DEC)</a>");
            }
        });
        add(new DatePicker());
    }
}

It is rendering ok. But when the component is re-rendered via ajax
(target.addComponent(dateTextField))
my behavior is re-added. After each re-render my link looks like this:
[component] (DEC)(DEC)(DEC)(DEC)... [calendarIcon]


How to fix it?

Thanks in advance,
Artur


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