Activating strategies after adding the layer to the map. r=elemoine (closes #1920)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@9266 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Layer/Vector.js

@@ -350,6 +350,15 @@ OpenLayers.Layer.Vector = OpenLayers.Class(OpenLayers.Layer, {
             this.renderer.map = this.map;
             this.renderer.setSize(this.map.getSize());
         }
+    },
+
+    /**
+     * Method: afterAdd
+     * Called at the end of the map.addLayer sequence.  At this point, the map
+     *     will have a base layer.  Any autoActivate strategies will be
+     *     activated here.
+     */
+    afterAdd: function() {
         if(this.strategies) {
             var strategy, i, len;
             for(i=0, len=this.strategies.length; i<len; i++) {