fnFilterKey = function (sKey) {
			var aFiltered = FilterProcessor.apply([sKey], oCombinedFilter, function(vRef, sPath) {
				// Only used in client mode, so deep path isn't needed
				var oContext = that.oModel.getContext('/' + vRef);
				return that.oModel.getProperty(sPath, oContext);
			}, that.mNormalizeCache);
			return aFiltered.length > 0;
		}
Process the currently set filters clientside. Uses the FilterProcessor and only works if the binding is running
in the OperationModes "Client" or "Auto".

@private