kogrid not updating column when data changed

i have simple data like this :

```
var dataFromAjax = [
{Id : 1, Name : "Yoza", Status : 1},
{Id : 2, Name : "Dhika", Status : 1}
];
```

and next data from ajax will have different schema. like this :

```
var nextData = [
{Id : 1, Name : 'Yoza', Job : 'Programmer', Phone : '08788'},
{Id : 1, Name : 'Dhika', Job : 'Designer', Phone : '99987922'}
]
```

in my piece of code :

```
self.Data = ko.observableArray();
self.Data(nextData);
self.Data.valueHasMutated();
```

the problem is column not updated. column still same like first schema, that are id, name and status. Job and Phone not rendered. how to render different schema?

Start by tracing how KoGrid derives its columns from self.Data and how observableArray updates are handled; the issue provides no repository file or test entry point. Reproduce the transition from dataFromAjax to nextData and determine whether changing the schema is supported. Done means the Job and Phone columns render after the data replacement, with the earlier columns handled consistently.

Written by the indexing model from the issue text.