[Lazarus] Control client area position

[Felipe Monteiro de Carvalho]

Hello,

Does anyone know how to set in a control that it's client area starts
in a non-standard position? I'd like to implement a custom-drawn
TGroupBox and therefore I need to apply a delta to the starting X and
Y position of child controls so that the (0,0) pos is bellow the
caption and out of the border.

thanks,
-- 
Felipe Monteiro de Carvalho