I am new to `Backbone`, so can't understand what I am doing wrong. What I need is to override saveCompat (`media-models.js` `line 310`, `WP 3.9.1`). I am trying to do it same way I have overridden some media views

```
wp.media.model.Attachment = wp.media.model.Attachment.extend({

    saveCompat: function( data, options ) {
        some code here...
    }
});

```

But it doesn't work for me. `Native WordPress saveCompat` is executed. At the same time the very same idea is perfectly working for `wp.media.view.AttachmentCompat` for example

```
wp.media.view.AttachmentCompat = wp.media.view.AttachmentCompat.extend({

    save: function( event ) {
        some code here...
    }
});

```

Thanks in advance!