code: public JComponent[] addSelector(String fieldName, Constraint filter, String attributes) {
          Map context = new HashMap();
          context.put(ComboBoxBinder.FILTER_KEY, filter);
          return addBinding(getBindingFactory().createBinding(JComboBox.class, fieldName), attributes,
                  getLabelAttributes());
      }
docs: Adds the field to the form by using a selector component.
  
  @param fieldName
  the name of the field to add
  @param filter
  optional filter constraint for the items of the selector
  @param attributes
  optional layout attributes for the selector component. See {@link TableLayoutBuilder} for syntax
  details
  @return an array containing the label and the selector component which where added to the form