"add a destroy() function that cycles through the kept references to the buttons and kills their circular refs" to the map object. Patch in #578 by euzuro

git-svn-id: http://svn.openlayers.org/trunk/openlayers@2919 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/MouseToolbar.js

@@ -57,6 +57,19 @@ OpenLayers.Control.MouseToolbar.prototype =
 
         return this.div;
     },
+
+    /**
+     * 
+     */
+    destroy: function() {
+        for( var btnId in this.buttons) {
+            var btn = this.buttons[btnId];
+            btn.map = null;
+            btn.events.destroy();
+        }
+        OpenLayers.Control.MouseDefaults.prototype.destroy.apply(this, 
+                                                                 arguments);
+    },
     
     _addButton:function(id, img, activeImg, xy, sz, title) {
         var imgLocation = OpenLayers.Util.getImagesLocation() + img;