Handler.Box.destroy: destroy the dragHandler. r=bartvde (closes #2697)

git-svn-id: http://svn.openlayers.org/trunk/openlayers@10422 dc9f47b5-9b13-0410-9fdd-eb0c1a62fdaf

lib/OpenLayers/Handler/Box.js

@@ -60,6 +60,17 @@ OpenLayers.Handler.Box = OpenLayers.Class(OpenLayers.Handler, {
                                 this, callbacks, {keyMask: this.keyMask});
     },
 
+    /**
+     * Method: destroy
+     */
+    destroy(): function() {
+        if (this.dragHandler) {
+            this.dragHandler.destroy();
+            this.dragHandler = null;
+        }            
+        OpenLayers.Handler.prototype.destroy.apply(this, arguments);
+    },
+
     /**
      * Method: setMap
      */