Hi,

I've noticed (though it's not documented) that if the fields array of the Filter widget is not defined, it will use the fields defined in the dataSource, and the 'label', 'previewFormat', 'editorTemplate' and 'operators' properties can be added to the dataSource fields object to be applied to the Filter widget.

This is extremely helpful and should probably be described in the documentation.

I'd like to suggest (if it's not already another undocumented feature) that dataSource fields can be hidden from the Filter widget, perhaps with a simple boolean such as 'filter: false'

Thanks