ExpandNode in the Dimension Filter

Dear community

I would like to expand the top node in the dimension filter (see in the pictures below). Has anybody a solution for that?

I have already consulted:

http://scn.sap.com/community/businessobjects-design-studio/blog/2015/05/25/design-studio-innovation-series--topic-5-implementing-a-hierarchy-filter-with-standard-and-scn-developer-community-sdk-components

sap.com/businessobject/product_guides/AAD12/en/ds12_user_en.pdf