html part

```
<input data-bind="kendoComboBox: { dataTextField: 'FirstName', dataValueField: 'PersonID',  data: AllUsers,template: '<span>#= data.FirstName # #= data.LastName # </span>',  value: SelectedUserID, 
change: UserSelectionChanged}" />

```

event handler inside model

```
var self= this;...    
self.UserSelectionChanged = function () {

        $.ajax({
            type: "POST",
            url: defaultUri + '/Home/GetUserTasks',
            data: JSON.stringify({ PersonID: self.SelectedUserID() }),
            contentType: "application/json; charset=utf-8",
            dataType: "json",
            success: function (o) {
                self.SelectedUserTask(null);
                self.SelectedUserTask(o);
                //RRM: Added this line below so that whenever user dropdown is changed or refresh button is clicked in AssignedTo the first task of that particular user is Selected.
                self.selectTask(o[0]);

            }
        });
    };

```

here the event is being called but the data in `self` is not there. The event doesn't seems to be bind well with knockout.
how to properly bind the `ko` event in the `kendo combobox` event?