Fill tree from webdynpro code

Hi masters.
I need to fill a tree.

I execute a bapi from webdynpro when i clicked a button, this bapi retrieves two internal tables.
Those Internal tables are related, so i need to pass them from  a tree.

Note: I already saw the webdynpro demo programs and one uses supply function and another is really complex.

Someone have an example in code how to fill a tree ??

The requiriment is really similar to DEMOTREE. (  but i need wothout supply functions).

Thanks