code: function(oThis){
  		var iVisibleItems = 0;
  
  		var jAreaRef = oThis.$("area");
  		var jItems = jAreaRef.children();
  
  		var bRtl = sap.ui.getCore().getConfiguration().getRTL();
  		var lastOffsetLeft = (bRtl ? 100000 : 0);
  
  		jItems.each(function(iIdx) {
  			if (iIdx == 0) {
  				return true;
  			}
  
  			var currentOffsetLeft = this.offsetLeft;
  			var bLineBreak = (bRtl ? (currentOffsetLeft >= lastOffsetLeft) : (currentOffsetLeft <= lastOffsetLeft));
  
  			if (bLineBreak) {
  				iVisibleItems = iIdx;
  				return false;
  			} else if (jQuery(this).attr("id") == oThis.getId() + "-ovrflw") {
  				// This is the overflow button, there was no line break
  				iVisibleItems = iIdx;
  				return false;
  			} else {
  				// Regular item, to the right of the last one, so just proceed
  				lastOffsetLeft = currentOffsetLeft;
  				return true;
  			}
  		});
  
  		return iVisibleItems;
  	}
docs: Compute actual number of items currently hidden due to overflow