Custom Button in MessageDialog - wicket

Question

I want to add my custom button with AjaxEventBehavior to MessageDialog , i can add simple custom button without AjaxEventBehavior by extending DialogButton class, but this will be useless button with out listener, anyone no how to do it?
here is my code:
import com.googlecode.wicket.jquery.ui.widget.dialog.MessageDialog;
import org.apache.wicket.ajax.AjaxRequestTarget;
import
org.apache.wicket.core.request.handler.IPartialPageRequestHandler;
import org.apache.wicket.model.Model;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.util.List;
public class TipOfTheDayDialog extends MessageDialog {
private static final Logger log =
LoggerFactory.getLogger(TipOfTheDayDialog.class);
Model<String> model = null;
List<DialogButton> dialogButtons =null;
public TipOfTheDayDialog(String id, Model<String> model,List<DialogButton> dialogButtons) {
super(id, Model.of("Совет дня"), model, dialogButtons);
this.model = model;
}
#Override
public void onClose(IPartialPageRequestHandler handler, DialogButton button) {}
#Override
public void onClick(AjaxRequestTarget target, DialogButton button)
{
if(!button.getName().equals("next")){
super.close(target,button);
this.close(target, button);
}else {
model.setObject("another message");
target.add(this);
}
}
}
I have decided to override method onclick instead of adding button with its own listener, but now i have another problem, i can't change message of dialog without it's closing , when i change message by this line of the code: model.setObject("another message"); and then add it to the target by this code : target.add(this); dialog window closes, how to fix it?