diff --git a/addons/web/static/lib/nivjs/src/niv.js b/addons/web/static/lib/nivjs/src/niv.js
index e572edc73c1..e2c997a64a0 100644
--- a/addons/web/static/lib/nivjs/src/niv.js
+++ b/addons/web/static/lib/nivjs/src/niv.js
@@ -45,54 +45,88 @@ niv = (function() {
 
         // Create a new Class that inherits from this class
         this.Class.extend = function(prop) {
-            var _super = this.prototype;
+        var _super = this.prototype;
 
-            // Instantiate a base class (but only create the instance,
-            // don't run the init constructor)
-            initializing = true;
-            var prototype = new this();
-            initializing = false;
+        // Instantiate a web class (but only create the instance,
+        // don't run the init constructor)
+        initializing = true;
+        var prototype = new this();
+        initializing = false;
 
-            // Copy the properties over onto the new prototype
-            for ( var name in prop) {
-                // Check if we're overwriting an existing function
-                prototype[name] = typeof prop[name] == "function"
-                        && typeof _super[name] == "function"
-                        && fnTest.test(prop[name]) ? (function(name, fn) {
-                    return function() {
-                        var tmp = this._super;
+        // Copy the properties over onto the new prototype
+        for (var name in prop) {
+            // Check if we're overwriting an existing function
+            prototype[name] = typeof prop[name] == "function" &&
+                              typeof _super[name] == "function" &&
+                              fnTest.test(prop[name]) ?
+                    (function(name, fn) {
+                        return function() {
+                            var tmp = this._super;
 
-                        // Add a new ._super() method that is the same method
-                        // but on the super-class
-                        this._super = _super[name];
+                            // Add a new ._super() method that is the same
+                            // method but on the super-class
+                            this._super = _super[name];
 
-                        // The method only need to be bound temporarily, so we
-                        // remove it when we're done executing
-                        var ret = fn.apply(this, arguments);
-                        this._super = tmp;
+                            // The method only need to be bound temporarily, so
+                            // we remove it when we're done executing
+                            var ret = fn.apply(this, arguments);
+                            this._super = tmp;
 
-                        return ret;
-                    };
-                })(name, prop[name]) : prop[name];
+                            return ret;
+                        };
+                    })(name, prop[name]) :
+                    prop[name];
+        }
+
+        // The dummy class constructor
+        function Class() {
+            // All construction is actually done in the init method
+            if (!initializing && this.init) {
+                var ret = this.init.apply(this, arguments);
+                if (ret) { return ret; }
             }
-
-            // The dummy class constructor
-            function Class() {
-                // All construction is actually done in the init method
-                if (!initializing && this.init)
-                    this.init.apply(this, arguments);
+            return this;
+        }
+        Class.include = function (properties) {
+            for (var name in properties) {
+                if (typeof properties[name] !== 'function'
+                        || !fnTest.test(properties[name])) {
+                    prototype[name] = properties[name];
+                } else if (typeof prototype[name] === 'function'
+                           && prototype.hasOwnProperty(name)) {
+                    prototype[name] = (function (name, fn, previous) {
+                        return function () {
+                            var tmp = this._super;
+                            this._super = previous;
+                            var ret = fn.apply(this, arguments);
+                            this._super = tmp;
+                            return ret;
+                        }
+                    })(name, properties[name], prototype[name]);
+                } else if (typeof _super[name] === 'function') {
+                    prototype[name] = (function (name, fn) {
+                        return function () {
+                            var tmp = this._super;
+                            this._super = _super[name];
+                            var ret = fn.apply(this, arguments);
+                            this._super = tmp;
+                            return ret;
+                        }
+                    })(name, properties[name]);
+                }
             }
+        };
 
-            // Populate our constructed prototype object
-            Class.prototype = prototype;
+        // Populate our constructed prototype object
+        Class.prototype = prototype;
 
-            // Enforce the constructor to be what we expect
-            Class.prototype.constructor = Class;
+        // Enforce the constructor to be what we expect
+        Class.constructor = Class;
 
-            // And make this class extendable
-            Class.extend = arguments.callee;
-            
-            return Class;
+        // And make this class extendable
+        Class.extend = arguments.callee;
+
+        return Class;
         };
     }).call(lib);
     // end of John Resig's code
diff --git a/addons/web/static/lib/nivjs/test/test.js b/addons/web/static/lib/nivjs/test/test.js
index c93dea99ac6..244ba8d7f26 100644
--- a/addons/web/static/lib/nivjs/test/test.js
+++ b/addons/web/static/lib/nivjs/test/test.js
@@ -115,6 +115,10 @@ test("base", function() {
     equal($el.length, 1);
     equal($el.parents()[0], $("body")[0]);
     equal($el.html(), "test");
+    
+    var y = new Claz(x);
+    equal(y.getParent(), x);
+    
     x.destroy();
     $el = $("#testdiv");
     equal($el.length, 0);
diff --git a/addons/web/static/src/js/core.js b/addons/web/static/src/js/core.js
index 9a564c653bb..7b88279cf16 100644
--- a/addons/web/static/src/js/core.js
+++ b/addons/web/static/src/js/core.js
@@ -999,7 +999,7 @@ openerp.web.Widget = niv.Widget.extend(_.extend({}, openerp.web.CallbackEnabledM
      */
     init: function(parent) {
         openerp.web.CallbackEnabledMixin.init.call(this);
-        this._super();
+        this._super(parent);
         this.session = openerp.connection;
     },
     /**