code: public String getSelectedResourceName() {
  
          String resParam = getJsp().getRequest().getParameter(getListId() + LIST_RACTION_SEL);
          if (CmsStringUtil.isNotEmpty(resParam)) {
              CmsListItem item = getList().getItem(resParam);
              return (String)item.get(LIST_COLUMN_NAME);
          }
          return null;
      }
docs: Returns the resource name of the selected resource.<p>
  
  @return the resource name of the selected resource or null if no resource was selected