code: public void setAppTitle(String title) {
  
          if (CmsStringUtil.isEmptyOrWhitespaceOnly(title)) {
              if (m_titleLabel != null) {
                  m_titleLabel.removeFromParent();
                  m_titleLabel = null;
              }
          } else {
  
              if (m_titleLabel == null) {
                  m_titleLabel = new Label();
                  m_titleLabel.setStyleName(I_CmsLayoutBundle.INSTANCE.toolbarCss().title());
                  m_buttonPanelLeft.insert(m_titleLabel, 0);
              }
              m_titleLabel.setText(title);
          }
      }
docs: Sets the toolbar title label.<p>
  
  @param title the title