Merge pull request #1018 from ahocevar/tilemanager-image-only

UTFGrid examples broken because of TileManager. r=@bartvde

lib/OpenLayers/TileManager.js

@@ -8,6 +8,8 @@
  * @requires OpenLayers/Util.js
  * @requires OpenLayers/BaseTypes.js
  * @requires OpenLayers/BaseTypes/Element.js
+ * @requires OpenLayers/Layer/Grid.js
+ * @requires OpenLayers/Tile/Image.js
  */
 
 /**
@@ -300,6 +302,7 @@ OpenLayers.TileManager = OpenLayers.Class({
      * evt - {Object} The listener argument
      */
     addTile: function(evt) {
+        if (evt.tile instanceof OpenLayers.Tile.Image) {
             evt.tile.events.on({
                 beforedraw: this.queueTileDraw,
                 beforeload: this.manageTileCache,
@@ -307,6 +310,10 @@ OpenLayers.TileManager = OpenLayers.Class({
                 unload: this.unloadTile,
                 scope: this
             });        
+        } else {
+            // Layer has the wrong tile type, so don't handle it any longer
+            this.removeLayer({layer: evt.tile.layer});
+        }
     },
     
     /**