code: public void getNewElement(final String resourceType, final I_CmsSimpleCallback<CmsContainerElementData> callback) {
  
          CmsRpcAction<CmsContainerElementData> action = new CmsRpcAction<CmsContainerElementData>() {
  
              @Override
              public void execute() {
  
                  getContainerpageService().getNewElementData(
                      getData().getRpcContext(),
                      getData().getDetailId(),
                      getRequestParams(),
                      resourceType,
                      getPageState(),
                      getLocale(),
                      this);
              }
  
              @Override
              protected void onResponse(CmsContainerElementData result) {
  
                  m_elements.put(result.getClientId(), result);
                  callback.execute(result);
              }
          };
          action.execute();
      }
docs: Returns the element data for a resource type representing a new element.<p>
  
  @param resourceType the resource type name
  @param callback the callback to execute with the new element data