what is the correct way: scrolledwindow in a notebook page

Hi,
I would like to add a scrolledwindow as a top panel of a notebook page.
What I have:

wxNotebook *f_notebook = new wxNotebook (f_toppanel, wxID_ANY);
wxScrolledWindow *f_scrolled_window = new wxScrolledWindow (f_notebook, 
wxID_ANY);
wxPanel *f_credentials_panel = new wxPanel (f_scrolled_window, wxID_ANY);
wxFlexGridSizer *f_credentials_sizer = new wxFlexGridSizer (7, 2, 2, 2);
... fill the sizer with widgets ...
f_credentials_panel->SetSizer (f_credentials_sizer);
f_notebook->AddPage (f_scrolled_window, "Credentials");


All I get is a white rectangle with no widgets. 
Can somebody please explain how I can do it the correct way?

TIA
Alexander

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