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This one is all about id <-> object mapping when using DropDowns:

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/**
 * @author igor vaynberg
 */
public class DropDownIdChoice extends DropDownChoice
{
 
    public DropDownIdChoice(String id, IModel model, IModel choices, IChoiceRenderer renderer, Class<?> type)
    {
        super(id, model, choices, renderer);
        setType(type);
    }
 
    @Override
    public String getModelValue()
    {
        final Object id = getModelObject();
        if (id != null)
        {
            return getConverter(getType()).convertToString(id, getLocale());
        }
        else
        {
            return NO_SELECTION_VALUE;
        }
    }
}