code: function(oThis, oMN) {
  			if (oMN && oMN.hasItems()) {
  				var $messageCount = oMN.$("counter");
  
  				// remove all possible classes
  				$messageCount.removeClass("sapUiMessageInformation");
  				$messageCount.removeClass("sapUiMessageSuccess");
  				$messageCount.removeClass("sapUiMessageWarning");
  				$messageCount.removeClass("sapUiMessageError");
  
  				// re-sort the messages and re-calc the severity level because they could have been changed
  				// if the NotiBar was invisible
  				fnSortMessages(oThis, oMN);
  				// add new corresponding class
  				var sLvl = oThis._sSeverestMessageLevel;
  				$messageCount.addClass("sapUiMessage" + sLvl);
  
  				// create key for description text
  				var iCount = oMN.getMessages().length;
  				var sKey = "NOTIBAR_MESSAGE_NOTIFIER_DESC_LEVEL_" + sLvl.toUpperCase() + (iCount === 1 ? "_SING" : "_PL");
  
  				// set description (i.e. "3 messages available: Highest severity
  				// "Error")
  				fnSetNotifierDescription(oThis, oMN, sKey, iCount);
  			}
  		}
docs: This method sets the corresponding CSS class to the message notifier's
  counter to set its corresponding color and sets the corresponding ARIA
  information to the notifier's description element
  
  @private