add:  this.events = new OpenLayers.Events(this, null, this.EVENT_TYPES); 
context:     initialize: function(layer, position, bounds, url, size) {        this.layer = layer;        this.position = position;        this.bounds = bounds;        this.url = url;        this.size = size;        //give the tile a unique id based on its BBOX.        this.id = OpenLayers.Util.createUniqueID("Tile_");    },
meta: 1027	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/1027/921347a81abbd7e6bd7240cfea7c075b0b7cfbdc/Tile.js/clean/lib/OpenLayers/Tile.js