fnEnableMessageSelect = function(oEvent) {
			var sEventId = oEvent.getParameter("EventId");

			if (sEventId === "messageSelected") {
				if (oEvent.getParameter("type") === "listenerAttached") {
					this._bEnableMessageSelect = true;
				} else if (oEvent.getParameter("type") === "listenerDetached") {
					this._bEnableMessageSelect = false;
				}

				this.fireEvent("_enableMessageSelect", {
					enabled : this._bEnableMessageSelect,
					notifier : this
				});
			}
		}
Checks if the 'messageSelected' event was attached to the Notifier. If so
the corresponding event is fired and e.g. the NotificationBar can react
on that.