KeyPress event on ComboBox

HTML

<script src="http://cdn.kendostatic.com/2013.1.514/js/kendo.web.min.js"></script>
<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.1.514/styles/kendo.common.min.css">
<link rel="stylesheet" href="http://cdn.kendostatic.com/2013.1.514/styles/kendo.default.min.css">
<div id="body">
    <input data-role="combobox" type="text" data-value-update="keyup" data-bind="value: text, keyPress: onKeyPress"/>
    <div id="output"></div>
</div>

JavaScript

kendo.data.binders.widget.keyPress = kendo.data.Binder.extend({
    init: function (element, bindings, options) {
        kendo.data.Binder.fn.init.call(this, element, bindings, options);
        var binding = this.bindings.keyPress;
        $(element.input).bind("keypress", function (e) {
           binding.get();
        });
    },
    refresh: function () { }
});

var viewModel = kendo.observable({
    text: '',
    onKeyPress: function () {
        $("#output").append("<div>keyPress</div>");
    }
});

kendo.bind("#body", viewModel);