docs: public void addField(String fieldGroup, final I_CmsFormField formField) {
  
          initializeFormFieldWidget(formField);
          m_fields.put(formField.getId(), formField);
          String modelId = formField.getModelId();
          m_fieldsByModelId.put(modelId, formField);
          formField.getLayoutData().put("group", fieldGroup);
          m_fieldsByGroup.put(fieldGroup, formField);
          //m_widget.addField(formField);
  
      }