code: private void addChannelButton() {
  
          Button button = CmsToolBar.createButton(
              FontOpenCms.LOG,
              CmsVaadinUtils.getMessageText(Messages.GUI_LOGFILE_LOGSETTINGS_TOOL_NAME_0));
          button.addClickListener(new ClickListener() {
  
              private static final long serialVersionUID = 1L;
  
              public void buttonClick(ClickEvent event) {
  
                  openSubView(PATH_LOGCHANNEL, true);
              }
          });
          m_uiContext.addToolbarButton(button);
  
      }
docs: Button to open channel settings path.<p>