widget Observable not cleaned out

[Bubleguy]

Description :
Use a widget and provide an observable (let say widgetDDL) that will received the widgetInstance after initialization.

Wrap the html node with an observable that will allow you to destroy the node (ex data-bind="if: myotherObs").

you can see that the kendo's 'detroy' method is call (triggered by domNodeDisposal) ... but the observable still refer the widgetInstance.

I would expect it to be null instead.

Full Example :
Html :

<div class="form-group" data-bind="if: DDLEnabled">
<input data-bind="kendoDropDownList: DDLConfig" id="DDLSelection" name="DDLSelection" type="text"></div>

ViewModel:

self.widgetDDL = ko.observable();
self.DDLEnabled = ko.observable(true);
self.DDLVal = ko.observable("");
self.DDLDatas = [{ Key: "key1", Value: "val1" }, { Key: "key2", Value: "val2" }];
self.DDLConfig = {
   value: self.DDLVal,
   widget: self.widgetDDL,
   optionLabel: 'Sélectionnez...',
   data: self.DDLDatas,
   dataTextField: 'Value',
   dataValueField: 'Key'
};