fnGroup = function(oItem) {
			//Added sModelName to consider named model cases if empty default model is picked without checking model bind to items.
			return oItem.getBindingContext(sModelName) ? oItemsBinding.getGroup(oItem.getBindingContext(sModelName)) : null;
		}
Fill the list with items.
@param {sap.m.UploadCollectionItem[]} items The UploadCollectionItems the internal list is to be filled with
@private