Retrieving object with related entity

General
1

I have two tables: Event and Region. Event has one Region. After I retrieve data, I have null value in ‘region’ field, but in database I can see that region field is not empty and references to Region. How can I retrieve related data? I’m using Javascript API.

2

I’ve tried to retrieve related entity according to manual: http://backendless.com/documentation/data/js/data_search_and_query.htm

but nothing works

var events = eventStorage.find({ options: {sortBy: 'title'}, related: ['region']});
var events = eventStorage.find({ options: {sortBy: 'title'}, related: [Region]});
var events = eventStorage.find({ options: {sortBy: 'title'}, related: {'region': Region}});

and even

        var relatedArray = new Array();
        relatedArray['region'] = Region;
        var events = eventStorage.find({ options: {sortBy: 'title'}, related: relatedArray});

returns Event entity with null region field.