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You should trap WM_GETMINMAXINFO message. In your form's class declaration put this:

  procedure WMGetMinMaxInfo(var Msg: TWMGetMinMaxInfo);
    message WM_GETMINMAXINFO;

procedure TYourForm.WMGetMinMaxInfo(var Msg: TWMGetMinMaxInfo);
begin
  inherited;
  with Msg.MinMaxInfo^ do
  begin
    ptMinTrackSize.Y:=200;
    ptMaxTrackSize.Y:=400;
  end;
end;

Related topics

Center a form in application
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Win32 Programmer's reference

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