code: public void actionDefine() throws JspException {
  
          // save initialized instance of this class in request attribute for included sub-elements
          getJsp().getRequest().setAttribute(SESSION_WORKPLACE_CLASS, this);
          try {
              performDefineOperation();
              // set the request parameters before returning to the overview
              setParamAction(DIALOG_SHOW_DEFAULT);
              setParamNewproperty(null);
              sendForward(CmsWorkplace.VFS_PATH_COMMONS + "property_advanced.jsp", paramsAsParameterMap());
          } catch (Throwable e) {
              // error defining property, show error dialog
              includeErrorpage(this, e);
          }
      }
docs: Performs the define property action, will be called by the JSP page.<p>
  
  @throws JspException if problems including sub-elements occur