@Override
    public void actionPerformed(final ActionEvent event) {
      NotifyUser.askConfirmation(
          i18n.t("Confirm, please:"),
          i18n.t(
              "This will open a specific chatroom to chat about this page or document (it's useful to chat with others about something while reading/modifing it). Are you sure?"),
          new SimpleResponseCallback() {
            @Override
            public void onCancel() {}

            @Override
            public void onSuccess() {
              final String subject =
                  i18n.t("Chat about: [%s]", session.getContentState().getTitle());
              final StateToken token = session.getCurrentStateToken();
              chatClient
                  .get()
                  .joinRoom(
                      token.toString().replaceAll("\\.", "-"),
                      subject,
                      session.getCurrentUserInfo().getShortName());
              chatClient.get().show();
            }
          });
    }