docs: public void showLoginView(String preselectedOu) {
  
          VerticalLayout content = new VerticalLayout();
          content.setSizeFull();
  
          m_targetOpener = new CmsLoginTargetOpener(A_CmsUI.get());
          //content.setExpandRatio(m_targetOpener, 0f);
          content.addComponent(m_loginForm);
          content.setComponentAlignment(m_loginForm, Alignment.MIDDLE_CENTER);
          content.setExpandRatio(m_loginForm, 1);
  
          setContent(content);
          if (preselectedOu == null) {
              preselectedOu = "/";
          }
          m_loginForm.selectOrgUnit(preselectedOu);
  
      }