code: private void _delActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event__delActionPerformed
          int[] i = _oList.getSelectedRows();
          String[] o = new String[i.length];
          for (int j = 0; j < i.length; j++) {
              o[j] = (String) _oList.getValueAt(i[j], 0);
          }
          if (R != null) {
              try {
                  R.rm(o);
              } catch (Rsession.RException ex) {
                  ex.printStackTrace();
              }
          }
          update();
      }
docs: GEN-LAST:event__addActionPerformed