rem: var tile = new OpenLayers.Tile.WFS(bounds, url, this.tileSize); 
add: var tile = new OpenLayers.Tile.WFS(this, bounds, url, this.tileSize); 
context:     addTile:function(bounds, position) {        url = this.getFullRequestString(                     { bbox:bounds.toBBOX() });        var tile = new OpenLayers.Tile.WFS(bounds, url, this.tileSize);        tile.draw();        tile.setPosition(position);        this.div.appendChild(tile.img);        return tile;    },
meta: 8310	/local1/tlutelli/issta_data/temp/all_js/javascript/2006_temp/2006/8310/54f519a2559741a82b828ddc663e73c3f75db0e9/WFS.js/clean/lib/OpenLayers/Layer/WFS.js