private void btnChangeActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnChangeActionPerformed
        if (isEdit) {
            RoosterProgramma.getInstance().showPanel(new ChAddEmployee(selectedEmployee), this);
        } else {
            String input = Utils.showFileChooser("Opslaan", "Medewerkersoverzicht");
            if (!input.isEmpty()) {
                ExcelExporter.Export(tblEmployee, new File(input.contains(".xls") ? input : input + ".xls"), true);
            }
        }
    }//GEN-LAST:event_btnChangeActionPerformed