Cleanup after the Navigation control (at least slightly more)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@5891 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Control/Navigation.js

@@ -54,6 +54,21 @@ OpenLayers.Control.Navigation = OpenLayers.Class(OpenLayers.Control, {
         OpenLayers.Control.prototype.initialize.apply(this, arguments);
     },
 
+    /**
+     * Method: destroy
+     * The destroy method is used to perform any clean up before the control
+     * is dereferenced.  Typically this is where event listeners are removed
+     * to prevent memory leaks.
+     */
+    destroy: function() {
+        OpenLayers.Control.prototype.destroy.apply(this,arguments);
+        this.deactivate();
+        this.dragPan.destroy();
+        this.wheelHandler.destroy();
+        this.clickHandler.destroy();
+        this.zoomBox.destroy();
+    },
+    
     /**
      * Method: activate
      */