code: public String getSelectedDialogUri() {
  
          if (LOG.isDebugEnabled()) {
              LOG.debug(
                  Messages.get().getBundle().key(
                      Messages.LOG_DIALOG_HANDLER_CLASS_2,
                      getClass().getName(),
                      getHandler()));
              LOG.debug(Messages.get().getBundle().key(
                  Messages.LOG_PARAM_RESOURCE_2,
                  getClass().getName(),
                  getParamResource()));
          }
          // get the handler class from the OpenCms runtime property
          I_CmsDialogHandler dialogClass = OpenCms.getWorkplaceManager().getDialogHandler(getHandler());
          if (dialogClass == null) {
              // error getting the dialog class, return to file list
              return CmsWorkplace.FILE_EXPLORER_FILELIST;
          }
          // get the dialog URI from the class defined in the configuration
          return dialogClass.getDialogUri(getParamResource(), getJsp());
      }
docs: Returns the uri of the dialog which will be displayed.<p>
  
  @return the uri of the property dialog