Custom css in DateWidget

@petschki

Maybe this is why we see different results?

    remadv_items = schema.List(
        title=_(
            'remadv_items_title',
            default = u'Remadv Items',
        ),
        value_type=schema.Object(
            title=_(
                'value_type_title',
                default = u'Table',
            ),
            schema=IRemadvItem,
        ),
        default=[],
        required=False,
    )
    directives.widget('remadv_items', DataGridFieldWidgetFactory)

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