another AUI layout question

[Harry]

I create 2 panes, both docked to the right and with wxAuiPaneInfo::Layer(1).
To define an order for the panes, I set 
wxAuiPaneInfo::Position(position-number).
However, Position() seems to be ignored, and the order of the panes docked
to the right seems to be rather the order of their creation.
In other words, the first-created is at the top, followed below by the 
second-created.
I have tried several values for Position(), without any result.

How can I force the positioning of these panes ? Do I need to pre-create 
them in the right order ?

Regards
Harry