ko.bindingHandlers.wysihtml5 = {
        control: "",
        init: function (element, valueAccessor, allBindingsAccessor, viewModel) {
            control = $(element).wysihtml5({
                "events": {
                    "change" : function() {
                        var observable = valueAccessor();
                        observable(control.getValue());
                    }
                }
            }).data("wysihtml5").editor;


        },
        update: function (element, valueAccessor, allBindingsAccessor, viewModel) {
            var content = valueAccessor();

            if (content != undefined) {
                control.setValue(content());
            }
        }
    };