Kendo Grid changes are not reflected in Source object - kendo-ui

Question

My bound objects have setters and while changing values in the grid cells, the setters are not getting called. Why?
function PresonDetails(_contactName, _contactTitle, _country, _companyName) {
Object.defineProperties(this, {
"ContactName": {
get: function () {
return this._contactName;
},
set: function (value) {
alert("New ContactName is :" + value)
this._contactName = value; //Setter is not get called when i change the value in grid.
},
enumerable: true,
configurable: true
},
"ContactTitle": {
get: function () {
return this._contactTitle;
},
set: function (value) {
this._contactTitle = value;
},
enumerable: true,
configurable: true
},
"Country": {
get: function () {
return this._country;
},
set: function (value) {
this._country = value;
},
enumerable: true,
configurable: true
},
"CompanyName": {
get: function () {
return this._companyName;
},
set: function (value) {
this._companyName = value;
},
enumerable: true,
configurable: true
}
});
this.ContactName = _contactName;
this.ContactTitle = _contactTitle;
this.Country = _country;
this.CompanyName = _companyName;
}
(function () {
var details = [];
details.push(new PresonDetails("ContactName1", "ContactTitle", "USA", "MICro"));
var $grid = $('#grid');
$grid.kendoGrid({
scrollable: true,
dataSource: details,
groupable: false,
sortable: false,
editable: true,
columns: [{
field: "ContactName",
title: "Contact Name",
width: 200
}, {
field: "ContactTitle",
title: "Contact Title",
width: 250
}, {
field: "CompanyName",
title: "Company Name"
}, {
field: "Country",
width: 150,
}]
});
})();
Here is the demo

Answer 1

You are right, it is not called but that's correct.
Well, what I mean is that when you bind an array (and that is what you have defined as details), Kendo UI converts it to an ObservableObject -actually a DataSource that internally uses an ObservableArray that is an array of ObservableObjects- but that doesn't mean that uses your object definition. What it does is creating an ObservableObject from your data but internally uses their own Model.
So, what you should do is defining a Model for your object and there you can define a set and a get method.