SAP Design Studio: collapse all nodes with code

Dear community

I would like to collapse all nodes from a dimension. I have already checked:

Dynamically expand and collapse hierarchies using scripting within Scorecard Component - SAP Business Objects Design Stu…

Expand/Collapse query structure?

Enabling Hierarchies within SAP Business Objects Design Studio 1.6 Scorecard Component

http://help.sap.com/businessobject/product_guides/AAD12/en/ds12_user_en.pdf

Because of my dashboard I have to do it by code. An alternative could by the following:

DS_1.collapseNode(dimension, node);

This would mean that I have to do that by 35 nodes (in my actual case).

Is there a solution?

Thanks for helping me

Best regards

Roman