@Override
      public void run(AnActionButton button) {
        // allow to delete several certificates at once
        for (X509Certificate certificate : myTreeBuilder.getSelectedCertificates(true)) {
          myCertificates.remove(certificate);
          myTreeBuilder.removeCertificate(certificate);
        }
        if (myCertificates.isEmpty()) {
          showCard(EMPTY_PANEL);
        }
        else {
          myTreeBuilder.selectFirstCertificate();
        }
      }
@Override
      public void run(AnActionButton button)