[Boa Constr] wxSizer, nested sizers and spacers

[Bell J. <jbe...@ya...>]

I'm trying to move from using layout constraints to
the wonderful world of wxSizers.  However, I have come
across what is undoubtedly a pretty basic problem that
I can't see my way through.

The problem boils down to the behaviour of spacers in
nested sizers.

If I create a wxStaticText control (lbl1) and a
wxTextCtrl (fld1) I can lay them out vertically with
spacers above and below with:

box=wxBoxSizer(wxVERTICAL)
box.Add(1,1,1,wxEXPAND)        
box.Add(self.lbl1)
box.Add(self.fld1)
box.Add(1,1,1,wxEXPAND)
self.SetAutoLayout(true)
self.SetSizer(box)
self.Layout()

Changing wxVERTICAL to wxHORIZONTAL works fine too. 
However, if boxes are nested as in:

box=wxBoxSizer(wxVERTICAL)
box2=wxBoxSizer(wxHORIZONTAL)
box2.Add(1,1,1,wxEXPAND)        
box2.Add(self.lbl1)
box2.Add(self.fld1)
box2.Add(1,1,1,wxEXPAND)
box.Add(1,1,1,wxEXPAND)
box.Add(box2)
box.Add(1,1,1,wxEXPAND)
self.SetAutoLayout(true)
self.SetSizer(box)
self.Layout()

the vertical layout is as expected, but the spacers in
the nested box (box2) don't expand.  Ie. everything's
on the left.  I assumed that a Layout() on box and/or
box2 was required but can find no combination that
works.

Thanks in Advance,
John Bell

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