docs: public void setCaption(String caption) {
  
          if (CmsStringUtil.isNotEmptyOrWhitespaceOnly(caption)) {
              getElement().removeClassName(I_CmsLayoutBundle.INSTANCE.dialogCss().hideCaption());
              m_caption.setText(caption);
          } else {
              getElement().addClassName(I_CmsLayoutBundle.INSTANCE.dialogCss().hideCaption());
          }
      }