code: public void openPageCopyDialog(String structureId, AsyncCallback<String> callback) {
  
          String callId = "" + CALL_COUNTER++;
          m_callbacks.put(callId, callback);
          getRpcProxy(I_CmsSitemapServerRpc.class).openPageCopyDialog(callId, "" + structureId);
  
      }
docs: Opens the page copy dialog.<p>
  
  @param structureId the structure id of the resource for which to open the dialog
  @param callback the callback to call with the result when the dialog has finished