XPages extlib oneui layout - How to add placebar actions dynamically

I want to add actions dynamically in PlaceBar (extlib oneui application layout).

We have couple of urls stored in some configuration documents. Based on these URLs I want to create Container node having Basic Child nodes in it. Every child node use one URL from list. How I can create container node and add child nodes to it dynamically? any sample SSJS/Java/CSJS code for this?

Thank you..