diff --git a/lib/OpenLayers/Layer.js b/lib/OpenLayers/Layer.js
index ad316fb1db..714bb4b9c4 100644
--- a/lib/OpenLayers/Layer.js
+++ b/lib/OpenLayers/Layer.js
@@ -226,6 +226,16 @@ OpenLayers.Layer.prototype = {
   /*                                                      */
   /********************************************************/
     
+    /** 
+     * @param {Boolean} isBaseLayer 
+     */
+    setIsBaseLayer: function(isBaseLayer) {
+        this.isBaseLayer = isBaseLayer;
+        if (this.map != null) {
+            this.map.events.triggerEvent("changelayer");
+        }
+    },
+    
     /**
      * @type String
      */