else if (e.getSource() == this.deleteButton) {
                JPanel panel = new JPanel();
                JLabel label = new JLabel("Enter a password:");
                JPasswordField pass = new JPasswordField(10);
                panel.add(label);
                panel.add(pass);
                String[] options = new String[] { "OK", "Cancel" };

                int option = JOptionPane.showOptionDialog(null, panel, "Delete - Operation", JOptionPane.NO_OPTION,
                        JOptionPane.OK_CANCEL_OPTION, null, options, options[1]);

                if (option == 0) {
                    char[] password = pass.getPassword();
                    if (this.password.compareTo(new String(password)) == 0) {

                        if (selectedRows == null)
                            JOptionPane.showMessageDialog(null, "You didn't select anything ?");
                        else {
                            ArrayList<Screw> AllScrews = new ArrayList<Screw>(db.getCollScrew());
                            InputStream inp = new FileInputStream(fileName);
                            Workbook wb = WorkbookFactory.create(inp);
                            Sheet sheet = wb.getSheetAt(0);
                            ArrayList<Screw> toDeleteScrews = new ArrayList<Screw>();
                            Arrays.sort(selectedRows);


                            for (int i = 0; i < selectedRows.length; i++) {
                                Screw toRemoveobject = AllScrews.get(selectedRows[i]);
                                toDeleteScrews.add(toRemoveobject);
                                db.getCollScrew().remove(toRemoveobject);
                                tmScrew.fireTableRowsDeleted(selectedRows[i], selectedRows[i]);

                            }

                            db.notifyObservers();
                            tmScrew.fireTableDataChanged();
                            tmScrew.fireTableStructureChanged();

                            ArrayList<Integer> foundIndexes = findRealIndexesFromExcel(fileName, toDeleteScrews);
                            Collections.reverse(foundIndexes);

                            for (int i = 0; i < foundIndexes.size(); i++) {
                                    removeRow(sheet, foundIndexes.get(i));
                            }
                            System.out.println("done");

                            FileOutputStream fileOut = new FileOutputStream(fileName);
                            wb.write(fileOut);
                            fileOut.close();
                        }

                    }