code: public void clearButtonsLeft() {
  
          m_itemsLeft.removeAllComponents();
          m_leftButtons.removeAllComponents();
          // in case the app title is set, make sure to keep the label in the button bar
          if (CmsStringUtil.isNotEmptyOrWhitespaceOnly(m_appIndicator.getValue())) {
              m_itemsLeft.addComponent(m_appIndicator);
          }
          updateFoldingThreshhold();
      }
docs: Clears the left toolbar buttons.<p>