I searched through the WDL Manual and I found nothing for resizing Panels.
I have noticed that in many games they just deal with the Panels looking smaller when the user picks a higher resolution than what the Panel was designed for (they do of course reposition the panels).
However, I have seen many games keep the panels perspective size the same no matter what resolution was selected. In that case I am almost certain they would have just made one large panel then down-size and save it for each resolution supported.
-Jeff