Use related content items with widgets
Built-in widgets for modules supporting related data have a property RelatedDataDefinition of type RelatedDataDefinition. RelatedDataDefinition is a definition class containing all information needed to display related data items, including:
    - RelatedItemId, RelatedItemType, RelatedItemProviderName, and RelatedFieldName properties, which give information about the related item.
 
    - RelationTypeToDisplay, which determines the relation type of the items that will be displayed - child or parent. By default, child items are displayed. To display parent items, set the value of the property to Parent.
 
    - RelatedItemSource,which defines the type of source for resolving the related item. This property is of type RelatedItemSource and can have the following values: 
    
        - DataItemContainer - the related item is resolved from the current DataItemContainer.
 
        - URL - the related item is resolved from the URL.
 
        - NoAutomaticBinding - the related item is not automatically resolved. You must set RelatedItemId and RelatedItemProviderName manually.
 
    
     
The following code is an example of NewsView item with configured RelatedDataDefinition to display child items: