[Lazarus] Turn a TGroupBox into a TPanel

[Alexsander Rosa]

The "ChildSizing" property allow several nice things with TGroupBox [1],
congratulations to the team. Under GTK2, the TPanel still have some annoying
bugs. If we had in TGroupBox a property "HideContourLineWhenCaptionIsEmpty"
or even "HideContourLine", the TGroupBox could replace TPanel in the "poor
man's layout manager" role.

[1] http://wiki.lazarus.freepascal.org/Autosize_/_Layout

-- 
Atenciosamente,
Alexsander da Rosa
Linux User #113925

"Extremismo na defesa da liberdade não é defeito.
Moderação na busca por justiça não é virtude."
-- Barry Goldwater
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