code: function handleAriaPositionInSet(iStartIndex, iEndIndex, aVisibleTiles) {
  		var i,
  			oTile = null;
  
  		aVisibleTiles = aVisibleTiles || this._getVisibleTiles();
  
  		for (i = iStartIndex; i < iEndIndex; i++) {
  			oTile = aVisibleTiles[i];
  			if (oTile) {
  				oTile.$().attr('aria-posinset', this._indexOfVisibleTile(oTile, aVisibleTiles) + 1);
  			}
  		}
  	}
docs: Handles the WAI ARIA property aria-posinset after a change in the TileContainer.
  @param {int} iStartIndex The index of the Tile to start with
  @param {int} iEndIndex The index of the Tile to complete with
  @param {sap.m.Tile[]} [aVisibleTiles] optional list of visible tiles in order to avoid filtering them again.
  @private