wicket-user-guide/src/docs/guide/bestpractices/bestpractices_8.gdoc

Always try to pass models on to the parent component. By that, you ensure that at the end of every request the method @IModel.detach()@ gets called. This method is responsible for a data cleanup. Another example: you have implemented your own model which persists the data in the @detach()@ method. So the call of @detach()@ is necessary for that your data gets persisted. You can see an exemplary passing to the super constructor here:

*Listing 11:*

{code}
public class RegistrationInputPanel extends Panel{
    public RegistrationInputPanel(String id, IModel<Registration> regModel) {
        super(id, regModel)
        // add components
    }
}
{code}