Vertical, Scrollable List of Panels with wxWidgets

Question

I have a class controlPanel : public wxPanel. Creating a dialog I just put a list of panels in a wxBoxSizer in constructor.

controlPanel *cp[20];
for(int i=0; i<20; i++)
{
     cp[i]=new controlPanel(this,true,"asd",i,i+1);
     bSizer5->Add(cp[i],0, wxALL|wxEXPAND, 0 );
}

But I can not scroll up and down to see all panels. What should I do? Also bSizer5 covers all other widgets, so bSizer5 is in top of all.