Hi,
set a break point in INITIAILIZE method of CL_POWL_MODEL and execute your WD application.
The parameter I_APPLID in the initialize method will give you the powl application id. For this application id,
use the tcode POWL_QUERYR to get the powl queries mapped to it. For changing the tab strip heading
go to t-code POWL_QUERY and change the description of the powl query you obtained in the previous step. Also you can get the powl type.
Go to t-code POWL_TYPE and get the feeder class for the powl type. In the feeder class, enhance method IF_POWL_FEEDER~GET_ACTIONS in order to change the button texts(the buttons before Print version).