                                      value="Cancel All Bills of this Patient" 
                                        action="#{billController.cancellAll}" 
                                        disabled="#{billSearch.bill.cancelled or billSearch.bill.refundedBill ne null}" 
                                        class="w-50 m-1"
                                        onclick="if (!confirm('Are you sure you want to Cancel This Bill ?'))
                                                    return false;