src/sap.m/src/sap/m/GrowingEnablement.js
function(oBinding) {
			var aSorters = oBinding.aSorters || [];
			var oSorter = aSorters[0] || {};
			return (oSorter.fnGroup) ? oSorter.sPath || "" : "";
		}
function(oBinding) {
			var aSorters = oBinding.aSorters || [];
			var oSorter = aSorters[0] || {};
			return (oSorter.fnGroup) ? oSorter.sPath || "" : "";
		}
function ( oBinding ) { var aSorters = oBinding . aSorters || [ ] ; var oSorter = aSorters [ 0 ] || { } ; return ( oSorter . fnGroup ) ? oSorter . sPath || "" : "" ; }
returns the first sorters grouping path when available
returns the first sorters grouping path when available