Wx::AUI Question

To all,

I am attempting to build a wxPerl application that uses Wx::AUI to create 
multiple "dockable" window panes.  It appears Wx::AUI defaults to four zones to 
dock windows that are organized horizontally or vertically depending upon 
whether you specify to dock left/right or top/bottom.  

In my case I may have from one to five windows displayed; if only 1 is open & 
has an attribute of "->CenterPane->Position(1)" ... it initially displays in 
the top half of the application frame instead of auto-sizing to the extents of 
the frame (maximized).

Is there a method to control programmatically the number of dock zones or the 
manner in which the window panes auto-size?  In the event the user elects to 
open/close multiple panes, I would like for the remaining panes to resize 
seamlessly.

Any help would be greatly appreciated.

Vaughn