showMsg = function () {

                var msg = 'The kernel has died, and the automatic restart has failed.' +
                        ' It is possible the kernel cannot be restarted.' +
                        ' If you are not able to restart the kernel, you will still be able to save' +
                        ' the notebook, but running code will no longer work until the notebook' +
                        ' is reopened.';

                dialog.kernel_modal({
                    title: "Dead kernel",
                    body : msg,
                    keyboard_manager: that.keyboard_manager,
                    notebook: that.notebook,
                    buttons : {
                        "Manual Restart": {
                            class: "btn-danger",
                            click: function () {
                                that.notebook.start_session();
                            }
                        },
                    "Don't restart": {}
                    }
                });

                return false;
            }
Initialize the notification widget for kernel status messages.

@method init_kernel_notification_widget