How to expand some ALV hierarchy levels during runtime at webdynpro abap

Hi,

I know that by using "if_salv_wd_table_hierarchy~set_expanded( abap_true )" method, I can expand all hierarchy levels of alv grid at webdynpro abap. But I have 3 hierarchy levels  and want to expand only 2 of them by default.

Is it possible?

Thanks in advance,

MERAL