<script>
                Telerik.Web.UI.RadNotification.prototype.dispose = function () {
                    //stop timers
                    this._stopTimer("_updateTimer");
                    this._stopTimer("_showTimer");
                    //cancel delay
                    this.cancelAutoCloseDelay();
                    //detach handlers
                    this._registerPopupHandlers(false);
                    this._createTouchScrollExtender(false);

                    if (this._popupBehavior)
                        this._popupBehavior.dispose();

                    var popup = this.get_popupElement();

                    if (Sys && Sys.WebForms) {
                        //fix for ajax update
                        var prm = Sys.WebForms.PageRequestManager.getInstance();
                        if (prm && prm.get_isInAsyncPostBack())
                            $telerik.disposeElement(popup);
                    }

                    if (popup && popup.parentNode)
                        popup.parentNode.removeChild(popup);

                    if (this._audioElement) {
                        this._audioElement.parentNode.removeChild(this._audioElement)
                    }

                    Telerik.Web.UI.RadNotification.callBaseMethod(this, "dispose");
                }
            </script>