code: function (iBeginDragIndex, iControlCount) {
  				if (iBeginDragIndex === iControlCount - 1) {
  					sInsertAfterBeforePosition = INSERT_BEFORE;
  					return iBeginDragIndex;
  				}
  				sInsertAfterBeforePosition = INSERT_AFTER;
  				return iBeginDragIndex + 1;
  			}
docs: Increases the drop index.
  @param {number} iBeginDragIndex Index of dragged control
  @param {number} iControlCount Number of controls
  @private