_initProperties: function() {
                    this._callSuper("_initProperties", arguments);

                    this.__defineGetter__("checked", function() {
                        return this.valueHolder.toDomNode().checked;
                    });

                    this.__defineSetter__("checked", function(val) {
                        this.valueHolder.toDomNode().checked = !!val;
                    });
                    this.__defineGetter__("value", function() {
                        return this.valueHolder.toDomNode().value;
                    });
                    this.__defineSetter__("value", function(val) {
                        this.valueHolder.toDomNode().value = val;
                    });
                },