I know I can forward the Ph_EVXXXX by PtSendEventToWidget(), but that approach needs registering of handlers for all 
type of events needed by all of the overlaid widgets at the upper one, and the from the upper one redistributing to the 
brothers behind. 
My question is if there is another better way by setup/creation of the widgets and not implementing forwarding logic?

You may want to create a PtRegion or PhRegion to collect the events. I guess you need just one region that overlays your
 widgets (I assume that they have the same position and the size):
- Make it sensitive to all types of events that you need. 
- Opaque to nothing. 
- You will need to position it (if your Raw widgets move)
- Attach just one raw callback and process your events.

Another approach is to have a Pt_CB_FILTER callback attached to the window to see all the raw events.