A new widgets, composition of other widgets

[Mauro]

Hi all.
I'm writing an apllication where I need to make a new widget made by a
composition of other standard widgets.

This is the constructor.

Display::Display(wxWindow *parent, wxWindowID id, int num,
        const wxPoint& pos, const wxSize& size,
        long style, const wxString& name)
: wxPanel(parent, id, pos,size, style, name)
{
  wxBoxSizer *box = new wxBoxSizer(wxHORIZONTAL);
  SetSizer(box);

  int nid = 100;

  wxString n;
  n.Printf(_T("%02d"), num);
  wxStaticText *nerog = new wxStaticText(this, nid++, n, 
                             wxDefaultPosition, wxSize(100,-1),
                             wxSIMPLE_BORDER | wxST_NO_AUTORESIZE);
  box->Add(nerog, 1, wxALL | wxEXPAND, 5);
  
  wxStaticText * kg = new wxStaticText(this, nid++, _T("---.--"));
  box->Add(kg, 2, wxALL | wxEXPAND, 5);

  wxStaticText *euro = new wxStaticText(this, nid++, _T("---.--"));
  box->Add(2, wxALL | wxEXPAND, 5);

  wxStaticText *sem = new wxStaticText(this, nid++, _T("R|V"));
  box->Add(2, wxALL | wxEXPAND, 5);

  wxStaticText *pagato = new wxStaticText(this, nid++, _T("P"));
  box->Add(1, wxALL | wxEXPAND, 5);

  wxButton *cash = new wxButton(this, nid++, _T("CASH"));
  box->Add(2, wxALL | wxEXPAND, 5);

  wxStaticText *connect = new wxStaticText(this, nid++, _T("C|NC"));
  box->Add(1, wxALL | wxEXPAND, 5);

  box->Layout();
}

The strange behavior is that all widgets is in the same position, not one
on-the-right of the other.

Why?

Mauro