code: private void aboutButtonActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_aboutButtonActionPerformed
          // Show information about Okapi
          AboutOkapi az = new AboutOkapi();
          az.setLocationRelativeTo(this);
          az.setVisible(true);
      }
docs: GEN-LAST:event_directoryButtonActionPerformed