code: public Window getWindow() {
          managementUIState.setBulkUploadWindowMinimised(false);
  
          bulkUploadWindow = new WindowBuilder(SPUIDefinitions.CREATE_UPDATE_WINDOW).caption("").content(this)
                  .buildWindow();
          bulkUploadWindow.addStyleName("bulk-upload-window");
          bulkUploadWindow.setImmediate(true);
          if (managementUIState.getTargetTableFilters().getBulkUpload().getProgressBarCurrentValue() <= 0) {
              bulkUploader.getUpload().setEnabled(true);
          } else {
              bulkUploader.getUpload().setEnabled(false);
          }
          return bulkUploadWindow;
      }
docs: create and return window
  
  @return Window window